Arbitron owns or has the rights to various trademarks, trade names or service marks used in its radio audience measurement business and subsidiaries, including the following: the Arbitron name and logo, Arbitrends^sm, RetailDirect^®, RADAR^®, Tapscan^®, Tapscan WorldWide^®, LocalMotion^®, Maximi$er^®, Maximi$er^® Plus, Arbitron PD Advantage^®, SmartPlus^®, Arbitron Portable People Meter^tm, Marketing Resources Plus^®, MRP^sm, PrintPlus^®, MapMAKER Direct^sm, Media Professional^sm, Media Professional Plus^sm, Qualitap^sm, MediaMaster^sm, Prospector^sm, and Schedule-It^sm.

The trademarks Windows^®, Media Rating Council^® and Homescan^® referred to in this Annual Report on Form 10-K are the registered trademarks of others.

In this report, Arbitron Inc. and its subsidiaries may be referred to as “Arbitron”, or the “Company”, or “we”, or “us”, or “our.”

This Annual Report on Form 10-K contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The statements regarding Arbitron in this document that are not historical in nature, particularly those that utilize terminology such as “may,” “will,” “should,” “likely,” “expects,” “anticipates,” “estimates,” “believes,” “plans” or comparable terminology, are forward-looking statements based on current expectations about future events, which we have derived from information currently available to us. These forward-looking statements involve known and unknown risks and uncertainties that may cause our results to be materially different from results implied in such forward-looking statements. These risks and uncertainties include, in no particular order, whether we will be able to:

There are a number of important factors that could cause actual events or our actual results to differ materially from those indicated by such forward-looking statements, including, without limitation, the factors set forth in “Item 1A. — Risk Factors” in this report, and other factors noted in Management’s Discussion and Analysis of Financial Condition and Results of Operations, particularly those noted under “Critical Accounting Policies and Estimates.”

In addition, any forward-looking statements represent our estimates only as of the day we first filed this annual report with the Securities and Exchange Commission and should not be relied upon as representing our estimates as of any subsequent date. While we may elect to update forward-looking statements at some point in the future, we specifically disclaim any obligation to do so, even if our estimates change.

Arbitron Inc., a Delaware corporation, was formerly known as Ceridian Corporation (“Ceridian”). Ceridian was formed in 1957, though its predecessors began operating in 1912. We commenced our audience research business in 1949. Our principal executive offices are located at 142 West 57th Street, New York, New York 10019, and our telephone number is (212) 887-1300.

We are a leading media and marketing information services firm primarily serving radio, cable television, advertising agencies, advertisers, out-of-home media, online media and, through our Scarborough Research joint venture with The Nielsen Company (“Nielsen”), broadcast television and print media. We currently provide four main services:

We provide radio audience measurement and related services in the United States to radio stations, advertising agencies and advertisers. We estimate the size and demographics of the audiences of radio stations in local markets in the United States and report these estimates and certain related data to our customers. Our customers use the information we provide for advertising transactions in the radio industry. Radio stations use our data to price and sell advertising time, and advertising agencies and advertisers use our data in purchasing advertising time. Our Radio All Dimension Audience Research (“RADAR”) service measures national radio audiences and the size and composition of audiences of network radio programs and commercials.

We also provide software applications that allow our customers to access the estimates resident in our proprietary databases and enable our customers to more effectively analyze and understand that information for sales, management, and programming purposes. Some of our software applications also allow our customers to access data owned by third parties, provided the customers have a separate license to use such third-party data.

In addition to our core radio ratings service, we also provide qualitative measures of consumer demographics, retail behavior and media consumption in local markets throughout the United States. We also provide custom research services to companies that are seeking to demonstrate the value of their advertising propositions. The comScore Arbitron Online Radio Ratings, a service jointly developed by Arbitron and comScore Networks Inc., is a custom service that measures the national audience of online radio networks. We also seek to market our quantitative and qualitative audience and consumer information to customers outside of our traditional base, such as the advertising sales organizations of local cable television companies, national cable television networks and out-of-home media sales organizations.

We have developed an electronic Portable People Meter (“PPM”) system of audience measurement for commercialization in the United States and have licensed our PPM technology to a number of international media information services companies to use in their media audience measurement services in specific countries outside of the United States. See “Item 1. Business — Portable People Meter” below.

Our quantitative radio audience measurement services and related software have historically accounted for a substantial majority of our revenue. The radio audience measurement service and related software revenues represented 79 percent and nine percent, respectively, of our total revenue in both 2007 and 2006. Our revenue from

Since 1965, we have delivered to the radio industry reliable and timely radio audience information collected from a representative sample of radio listeners. The presence of credible audience estimates in the radio industry has helped radio stations to price and sell advertising time, and advertising agencies and advertisers to purchase advertising time. The Arbitron ratings have also become a valuable tool for use in radio programming, distribution and scheduling decisions.

The consolidation of radio station ownership in the United States, among other factors, has led to a greater diversity of programming formats. As audiences have become more fragmented, advertisers have increasingly sought to tailor their advertising strategies to target specific demographic groups through specific media. The audience information needs of radio broadcasters, advertising agencies and advertisers have correspondingly become more complex. Increased competition and more complex informational requirements have heightened the need of radio broadcasters for improved information management systems and more sophisticated means to analyze this information. In addition, there is a demand for high-quality radio audience information internationally from the increasing number of commercial, noncommercial and public broadcasters in other countries.

As the importance of reaching niche audiences with targeted marketing strategies increases, broadcasters, publishers, advertising agencies and advertisers increasingly require that information regarding exposure to advertising be provided on a more granular basis and that this information be coupled with more detailed information regarding lifestyles and purchasing behavior. We believe the need to integrate purchase data information with advertising exposure information may create opportunities for innovative approaches to satisfy these information needs.

Since 1992, we have pursued a strategy of evolving our data collection business from diaries, which are mostly completed by hand and returned by mail from survey participants, to portable electronic measurement devices, which passively provide measurement services without additional manual effort by the survey participants beyond carrying the meter. We have pursued this strategy to improve quality by taking advantage of new technological capabilities and to address the vast proliferation of media delivery vehicles, both inside and outside of the home.

We have developed our proprietary PPM technology, which is capable of measuring audiences for programming and advertising purposes across multiple media including, among others, broadcast and satellite radio, broadcast, cable and satellite television, Internet, and retail in-store audio and video broadcasts. The PPM meter is a small mobile phone-sized device that survey participants carry throughout the day. The PPM meter automatically detects proprietary codes that are inaudible to the human ear, which broadcasters embed in the audio portion of their programming using technology and encoders we license to the broadcaster. We refer to the embedding of our proprietary codes into the audio portion of broadcasters’ programming as “encoding” the broadcast. These proprietary codes identify the media to which a survey participant is exposed throughout the day without the survey participant having to engage in any recall-based manual recording activities. At the end of each day, the survey participant places the PPM device into a base station that recharges the device and sends the collected codes to Arbitron for tabulation.

We believe there are many advantages to our PPM service. It is simple and easy for respondents to use. It requires no button pushing, recall or other effort by the survey participant to identify and write down channels or radio stations to which they tune. The PPM service can passively detect exposure to encoded media by identifying each source using our unique identification codes. We believe the PPM service will help support the media industry’s increased focus on providing accountability to advertisers for the investments made by advertisers. It will help to shorten the time period between when advertising runs and when audience delivery is reported, and can provide multimedia measurement from the same survey participant. The PPM service also produces high-quality

Domestic.  We have begun execution of our previously announced plan to roll out progressively our PPM ratings service to the top 50 U.S. radio markets by the end of 2010. We currently use the PPM ratings service to produce ratings in the Houston-Galveston and Philadelphia local markets. In January 2007, following extensive review, the Media Rating Council (“MRC”) accredited the Houston-Galveston PPM methodology. For more information regarding the MRC accreditation, see “Item I. Business — Governmental Regulation.” In June 2007, the MRC also accredited the average-quarter-hour, time-period television ratings data produced by the PPM ratings service in Houston-Galveston. The PPM service in Houston-Galveston is the first and only MRC-accredited portable meter service in the United States, collecting data on radio, local television and cable use from one sample of consumers, at home and away from home. In July 2007, we replaced our diary-based ratings service with our PPM ratings service in Houston-Galveston as the currency for radio advertising transactions.

We are committed to obtaining and maintaining MRC accreditation in each United States local market where we commercialize our PPM service. As we have previously announced, we are also committed to completing the MRC audit of our PPM service, sharing the results of the audit with the MRC PPM audit subcommittee, and producing two months of “pre-currency” demonstration data in each United States local market prior to commercializing our PPM service in that market. On the basis of an MRC audit of the Philadelphia PPM methodology and execution completed in 2007, the sharing of the results of such audit with the MRC’s PPM audit subcommittee, and the completion of a two-month pre-currency period for training and electronic measurement transition, in March 2007, we replaced our diary-based ratings service with our PPM ratings service in Philadelphia as the currency for radio advertising transactions. Following review of the results of the audits and our replies to the MRC’s follow-up queries, the MRC subsequently denied accreditation of the Philadelphia local market PPM ratings service in January 2008.

In 2007 the MRC also completed an audit of the New York local market PPM methodology and execution, and the results of that audit were shared with the MRC PPM audit subcommittee in late 2007. The MRC subsequently denied accreditation of the New York local market PPM ratings service in January 2008.

As of the date of this Annual Report on Form 10-K, and in accordance with standard MRC guidelines, we have begun the process of re-auditing the Philadelphia and New York PPM methodologies and execution and expect to continue to work with the MRC to obtain accreditation of the Philadelphia and New York local market PPM ratings services.

In November 2007, we announced our decision to delay the commercialization of the PPM ratings service in nine additional local markets in order to address feedback regarding the PPM service we had received from our customers, the MRC, and certain other constituencies. New York, Nassau — Suffolk and Middlesex — Somerset — Union are expected to be delayed by nine months; Los Angeles, Riverside-San Bernardino and Chicago by six months; and San Francisco, San Jose and Dallas-Ft. Worth by three months. We intend to replace the diary service with the PPM service in each of these markets other than Dallas-Ft. Worth in September 2008. We intend to commercialize Dallas-Ft. Worth in December 2008. Commercialization of the remaining top 50 U.S. radio markets by the end of 2010 is currently on schedule with our previously announced rollout plan. During the delay, we have been working with our customers and industry organizations to clearly define what improvements to the PPM service may be appropriate, and have been implementing a series of such improvements designed to enhance the quality of the PPM service and maintain the confidence of the radio industry in the audience estimates that the PPM service produces.

To date, more than 15 radio broadcasting groups, including Clear Channel Communications, Inc. (“Clear Channel”), our largest customer, CBS Radio, Citadel Broadcasting, Cox Broadcasting, Radio One and Cumulus, have signed long-term contracts to use the PPM service as and when we commercialize it in United States local markets. These broadcasters, and the markets for which they signed, accounted for approximately 80 percent of the

Although additional milestones remain and there is the possibility that the pace of commercialization of the PPM ratings service could be slowed further, we believe that the PPM ratings service is both a viable replacement for and a significant enhancement to our diary-based ratings service in major radio markets, and is an essential component of our anticipated future growth. If the pace of the commercialization of our PPM ratings service is slowed further, revenue increases that we expect to receive related to the service will also be delayed.

Commercialization of our PPM radio ratings service requires and will continue to require a substantial financial investment. We believe we have sufficient cash as well as access to our existing credit facility to fund such requirements. We currently estimate that the annual capital expenditures associated with the PPM ratings service commercialization for audience ratings measurement will be approximately $20.0 million. We also anticipate that, over the first two to three years of commercialization, our results of operations will be materially negatively impacted as a result of the rollout of our PPM ratings service. The amount of capital required for deployment of our PPM ratings service and the impact on our results of operations will be greatly affected by the speed of the rollout schedule. While commercialization of the PPM ratings service will have a near-term negative impact on our results of operations, which impact likely will be material, restoration of our operating margins following the completion of the PPM transition process in the top 50 U.S. radio markets remains our goal, although there can be no assurance that this will be the case.

As previously announced, during 2008 we intend to pursue MRC accreditation of our PPM service in individual local markets and to implement a series of improvements designed to enhance the quality of our PPM service. These initiatives include, among others, measures designed to address the total number of persons participating in our PPM panels, the total number of persons aged 18 to 34 participating in our PPM panels, the average number of panelists from whom usable data is produced on a daily basis, and response rates. On February 1, 2008, we announced a series of benchmarks we intend to pursue with our PPM service. For more information regarding our 2008 PPM initiatives and benchmarks, see “Item 1. Business — Radio Audience Measurement Services — Collection of Listener Data Through PPM Methodology” and “— Response Rates and Sample Proportionality” below. Pursuant to our revised rollout schedule, we intend to launch the PPM service in the local markets of New York, Nassau-Suffolk and Middlesex-Somerset-Union, Los Angeles, Riverside-San Bernardino, Chicago, San Francisco, San Jose, Detroit, Atlanta, and Washington, DC, during the second half of 2008.

International.  We have entered into agreements with a number of international media information services companies pursuant to which we have granted those companies licenses to use our PPM technology in their audience measurement services in specific countries outside of the United States. Taylor Nelson Sofres plc (“TNS”), a global market insight and information group, is the most significant international licensee of our PPM technology. Generally, under these license agreements we sell PPM hardware and equipment to the licensee for use in their media measurement services and collect a royalty once the service is deemed commercial. Our PPM technology is currently being used for media measurement in ten countries, including two active trials.

Our PPM technology was first used in a commercial audience measurement panel in Belgium and has been used to track TV and radio there since 2003. Our PPM technology has been used for TV currency ratings in Montreal and Quebec, Canada, since 2004. In 2006, Norway adopted a service using PPM technology to produce radio currency ratings and Kazakhstan adopted a service using PPM technology to produce TV currency ratings. Also in 2006, RAJAR (the UK radio research consortium) together with the Broadcasters Audience Research Board (the UK TV research consortium, “BARB”) awarded TNS a contract for a PPM-based research and development panel in London. The RAJAR award was the result of a four-year evaluation process that included competitive assessments of the Media Audit/IPSOS “Smart Cell Phone” meter, the GfK Group “wristwatch” meter and the Eurisko Media Monitor system. In 2008, services using PPM technology will produce radio currency ratings in Denmark, and TV and radio currency ratings in Iceland. In addition, the PPM encoding technology has been used as part of a set top television measurement system in Singapore since 2001.

On October 19, 2007, TNS announced a plan for comprehensive field tests in Beijing, China, using the PPM system for radio audience measurement. CSM Media Research, a joint venture between TNS and CTR Market Research, China’s leading market research company, will conduct the field trials in Beijing. On December 18, 2007, TNS announced that BARB had awarded it two contracts to measure television audiences and produce currency ratings in the UK beginning in 2010. These agreements contemplate the potential use of a TNS meter incorporating licensed PPM technology. Our PPM technology is also being used to produce radio audience estimates in a field trial in Italy.

These international licenses are currently not a material part of our business.

Collection of Listener Data Through Diary Methodology.  We use listener diaries to gather radio listening data from persons aged 12 and over in sample households in the 300 U.S. local markets in which we currently provide diary-based radio ratings. Participants in Arbitron surveys are selected at random by landline telephone number. When participants (whom we refer to as “diarykeepers”) agree to take part in a survey, we mail them a small, pocket-sized diary and ask them to record their listening in the diary over the course of a seven-day period. We ask diarykeepers to report in their diary the station(s) to which they are listening, when they are listening and where they are listening, such as home, car, work or other place. Although survey periods are 12 weeks long, no participant keeps a diary for more than seven days. Each diarykeeper receives a diary, instructions for filling it out and a small cash incentive. The incentive varies according to markets, and the range is generally $1.00 to $6.00 for each diarykeeper in the household and up to $10.00 in certain incentive programs for returned diaries. In addition to the cash incentives included with the diaries, further cash incentives are used at other points in the survey process along with other communications such as follow-up letters and phone calls to maximize response rates. Diarykeepers mail the diaries to our operations center in Columbia, Maryland, where we conduct a series of quality control checks, enter the information into our database and produce periodic audience measurement estimates. We receive and process more than 1.4 million diaries every year to produce our audience listening estimates. We measure each of our local markets at least twice each year, and major markets four times per year.

Collection of Listener Data Through PPM Methodology.  In our PPM service, we gather data about encoded audio material through the use of our PPM meters. We randomly recruit households to participate in the service (all persons six and older in the household). The household members are asked to participate in the panel for a period of up to two years, carrying their meters “from rise to retire” each day. Panelists earn points based on their compliance with the task of carrying the meter. Longer carry time results in greater points which are the basis for monthly cash incentives. Demographic subgroups that are less likely to comply, such as younger adults, are paid higher premiums based on their compliance. We consider the amount of the cash incentive that we pay to the PPM panelists to be proprietary information.

The meter collects the codes and adds a date/time stamp to each listening occasion. At the end of each day, panelists place their meters in a docking station and the information is downloaded to Arbitron’s facilities for editing and tabulation.

We issue a currency report for 13 four-week measurement periods per year. We issue weekly reports to station subscribers for programming information. Users access the currency data through a software system.

Response Rates and Sample Proportionality.  It has become increasingly difficult and more costly for us to obtain consent from persons to participate in our surveys. We must achieve response rates sufficient to maintain confidence in our ratings, the support of the industry and accreditation by the MRC. Response rates are one quality measure of survey performance among many and an important factor impacting costs associated with data collection. Overall response rates have declined over the past several years. If response rates continue to decline further or if recruitment costs significantly increase, our radio audience measurement business could be adversely affected.

One of the challenges in measuring radio listening, whether by using diaries or electronically, is to ensure that the composition of survey respondents is representative of the market being measured. We strive to achieve representative samples. A measure often used by clients to assess quality in our ratings is proportionality, which

In our PPM service, we also use a measure known as Designated Delivery Index (“DDI”). DDI measures sample proportionality based on how many persons in the sample represent a particular demographic compared to the number of persons expected to be in the sample based on the market’s sample target. In recent years, our ability to deliver good proportionality in our surveys, both diary-based and electronically measured, among younger demographic groups has deteriorated, caused in part by the trend among some households to disconnect their landline phones, effectively removing these households from the Arbitron sample frame. As consumers adopt modes of telecommunication other than telephone landlines, such as mobile phones, it is becoming increasingly difficult for us to reach and recruit participants.

We have committed extensive efforts and resources to address the decline of response rates and to maintain sample proportionality. Currently, we manually dial mobile-phone-only households for PPM recruitment only. We have conducted a number of research tests over the past two years to develop more efficient ways of contacting mobile-phone-only households to recruit participants. We have not yet announced a date for including these mobile-phone-only households in the diary service.

In recent years, we have announced a comprehensive set of initiatives to bolster response rates and improve sample proportionality among African-American, Hispanic, and young male respondents in our diary-based markets. These initiatives include providing for increases in cash incentives and other survey treatments. We continue to research and test new measures to address these sample quality challenges. The most significant response rate initiatives in 2007 included the completion of the rollout of the 2006 response rate and proportionality action plan and the opening of a third Arbitron owned and operated participant-interviewing center during the first quarter of 2007. Our experience is that internal interviewing centers outperform the outsourced calling center vendors that they replace. We believe that additional expenditures will be required in the future with respect to response rates and sample proportionality.

As the PPM service is rolled out, we expect to experience similar challenges in the operation of an electronic measurement service as are faced in the diary-based service, including those challenges related to response rate and sample proportionality. We also expect that additional measures to address these challenges will be implemented and require expenditures in addition to those required for our diary-based service. On August 31, 2007, we announced new initiatives and investments to address PPM panel maintenance concerns experienced in both the Houston-Galveston and Philadelphia markets. On February 1, 2008, we announced a series of four sample quality benchmarks that we intend to pursue with our PPM services to enhance confidence in PPM ratings as a currency. Rather than serving as guarantees, these benchmarks establish the starting point for where our PPM samples are currently performing, and identify the levels we intend to work toward in 2008 through a program of continued improvement. Specifically, these benchmarks concern total sample size, sample size for persons aged 18 to 34, average daily percentage of the installed panel that provides useable data (the “average daily in-tab”), and response rates. Currently, we have at least 30 initiatives in the testing or implementation stage for the PPM service that are designed to improve either response, compliance or both.

In December 2007, we announced a “sample size guarantee” that would provide a partial rebate to our customers for PPM radio ratings in any local market for a measurement period in which our delivered average daily in-tab among persons aged 18-54 falls below 80 percent of our published average daily in-tab target for that market. In Houston-Galveston and Philadelphia, the sample size guarantee took effect with the release of the December 2007 PPM survey month (November 13 — December 10, 2007), which we released on December 31, 2007. In future PPM local markets, the sample size guarantee will take effect with the release of the third currency PPM

Small Market Initiatives.  We are currently reviewing our services in U.S. local markets ranked 100 and smaller (approximately 200 markets). In concert with a group of broadcasters known as the Owner Operator Caucus, we have begun work in two phases. First, we plan to improve the qualitative information aspect of our current diary service beginning with the Fall 2008 Survey. Next, we are working on new methods of measuring media behavior in small markets along with more extensive qualitative information to better serve the needs of our clients. We expect the testing of the new methods to take place over the next two years.

Quality Improvement Initiatives.  We continually invest in quality improvements for our radio audience measurement services. In addition to the initiatives described above in “Radio Audience Measurement Services — Response Rates and Sample Proportionality,” we expect our 2008 quality improvement initiatives to include the following:

We provide our listening estimates in a number of different reports that we publish and license to our customers. The cornerstone of our radio audience measurement services is the Radio Market Report, which is available in all local markets for which we currently provide radio ratings. The Radio Market Report provides audience estimates for those stations in a market that meet our minimum reporting standards. The estimates cover a wide variety of demographics and dayparts, which are the time periods for which we report audience estimates. Each Radio Market Report contains estimates to help radio stations, advertising agencies and advertisers understand who is listening to the radio, which stations they are listening to, and where and when they are listening. Our proprietary data regarding radio audience size and demographics are generally provided to customers through multiyear license agreements.

We also license our respondent-level database through Maximi$er and Maximi$er Plus, which are services for radio stations, and Media Professional and Media Professional Plus, which are services for advertising agencies and advertisers. Our respondent-level database allows radio stations, advertising agencies and advertisers to customize survey areas, dayparts, demographics and time periods to support targeted marketing strategies. The Maximi$er service includes a Windows-based application to access a market’s entire radio diary database on a client’s personal computer. Radio stations use the Maximi$er service to produce information about their station and programming not available in Arbitron’s published Radio Market Reports. The Maximi$er Plus service allows radio stations to access our National Regional Database (“NRD”) to analyze ratings information for customer-defined groupings of stations in multiple markets and counties. The Media Professional service is designed to help advertising agencies and advertisers plan and buy radio advertising time quickly, accurately and easily. These services integrate radio planning and buying into one comprehensive research and media-buying tool. They allow advertising agencies and advertisers to uncover key areas critical to the buying process, including determining the most effective media

In addition to the Radio Market Report, we provide a range of ancillary services that include Radio County Coverage Reports, Hispanic Radio Data and Black Radio Data.

RADAR.  Our RADAR service provides a measurement of national radio audiences and the audience size of network radio programs and commercials. We provide the audience measurements for a wide variety of demographics and dayparts for total radio listening and for 56 separate radio networks.

We create network audience estimates by merging the radio listening of selected survey respondents with the actual times that network programs and commercials are aired on each affiliated station. We deliver the RADAR estimates through our PC 2010 software application, which includes a suite of products for sophisticated analysis of network audiences. We provide this service to radio networks, advertising agencies and network radio advertisers.

Since 2003, the RADAR survey sample has continually increased from 50,000 Arbitron diaries to a survey sample of approximately 200,000 Arbitron diaries in December 2007. Data from PPM commercial markets is also incorporated into the RADAR survey sample.

Software Applications.  In addition to our reports, we license software applications that provide our customers access to the audience estimates resident in our proprietary databases. These applications enable our customers to more effectively analyze and understand that information for sales, management and programming purposes. These services also help our customers to further refine sales strategies and compete more effectively for advertising dollars. Some of our software applications also allow our customers to access data owned by third parties, provided the customers have a separate license to use such third-party data.

Our Tapscan family of software solutions is used by many radio stations, advertising agencies and advertisers. The Tapscan software is one of the advertising industry’s leading radio analysis applications. It can help create illustrative charts and graphs that make complex information more useful to potential advertisers. Other features include pre-buy research, including frequency-based tables, cost-per-point analysis, hour-by-hour and trending, use of respondent-level data, automatic scheduling and goal tracking, instant access to station format and contact information. Our Tapscan Sales Management service provides software systems that help radio stations manage their advertising sales process and automate the daily tasks in a sales department. The Tapscan Sales Management applications combine a customer relationship management system with scheduling and research applications and with inventory/pricing management tools. Our SmartPlus service provides media buying software systems, including the SmartPlus software, to local and regional advertising agencies for broadcast and print media. Another Tapscan service, Qualitap, is also made available to television and cable outlets in the United States under a licensing arrangement with Marketron International, Inc.

The MapMAKER Direct service analyzes where the radio audience lives, and works to provide detailed maps and reports. Program directors can use this service to better understand their listeners and better target their promotional efforts. Our PD Advantage service offers radio station program directors the ability to create a variety of reports that help analyze the market, the audience and the competition.

Licensing of Respondent-Level Data.  In 2008 we expect to begin licensing our respondent-level database directly to certain of our customers and to third party data processors. This allows third party processors and customers to produce more detailed radio listening data by custom dayparts, demographic groups and geographic areas.

In our radio ratings service, we provide primarily quantitative data, such as how many people are listening. We also provide qualitative data, such as consumer and media usage information to radio stations, cable companies, television stations, out-of-home media, magazine and newspaper publishers, advertising agencies and advertisers. The qualitative data on listeners, viewers and readers provide more detailed socioeconomic information and information

We provide qualitative services tailored to fit a customer’s specific market size and marketing requirements, such as:

Each service profiles a market, the consumers and the media choices in terms of key characteristics. These services cover the major retail and media usage categories. We also provide training and support services that help our customers understand and use the local market consumer information that we provide.

Scarborough Report.  The MRC-accredited Scarborough service is provided through a joint venture between Arbitron and a subsidiary of Nielsen. Although our equity interest in the Scarborough Research joint venture is 49.5 percent, partnership voting rights and earnings are divided equally between Arbitron and Nielsen. The Scarborough service provides detailed information about media usage, retail and shopping habits, demographics and lifestyles in 81 large U.S. local markets, utilizing a sample of consumers in the relevant markets.

Scarborough data feature more than 2,000 media, retail and lifestyle characteristics, which can help radio stations, television stations, cable companies, advertising agencies and advertisers, newspaper and magazine publishers and out-of-home media companies develop an in-depth profile of their consumers. Examples of Scarborough categories include retail shopping (e.g., major stores shopped or purchases during the past 30 days), auto purchases (e.g., plan to buy new auto or truck), leisure activities (e.g., attended sporting event) and personal activities (e.g., golfing). Media information includes broadcast and cable television viewing, radio listenership, newspaper readership by section, magazine readership and yellow pages usage. This information is provided twice each year to newspapers and magazines, radio and television broadcasters, cable companies, out-of-home media, advertising agencies and advertisers in the form of the Scarborough Report. Scarborough also provides a Mid-Tier Local Market Consumer Study regarding media usage, retail and shopping habits, demographics, and lifestyles of adult consumers in certain U.S. local markets.

We are the exclusive marketer of the Scarborough Report to radio broadcasters, cable companies and out-of-home media. We also market the Scarborough Report to advertising agencies and advertisers on a shared basis with Scarborough Research. Scarborough Research markets the Scarborough Report to newspapers, magazines and online service providers. Nielsen markets the Scarborough Report to television broadcasters.

RetailDirect Service.  Our RetailDirect service is a locally oriented, purchase data and media usage research service provided in 20 midsized U.S. local markets. This service, which utilizes diaries and telephone surveys, provides a profile of the audience in terms of local media, retail and consumer preferences so that local radio and television broadcasters, out-of-home media and cable companies have information to help them develop targeted sales and programming strategies. Retail categories include automotive, audio-video, furniture and appliances, soft drinks and beer, fast food, department stores, grocery stores, banks and hospitals. Media usage categories include local radio, broadcast television, cable networks, out-of-home media, newspapers, yellow pages and advertising circulars.

Qualitative Diary Service/LocalMotion Service.  Our Qualitative Diary Service collects consumer and media usage information from Arbitron radio diarykeepers in 176 smaller U.S. local markets. The same people who report their radio listenership in the market also answer 27 demographic, product and service questions. We collect consumer behavior information for key local market retail categories, such as automotive sales, grocery, fast food, furniture and bedding stores, beer, soft drinks and banking. The Qualitative Diary Service also collects information about other media, such as television news viewership, cable television viewership, out-of-home media exposure and newspaper readership. This qualitative service provided for cable television companies is known as LocalMotion.

Custom Research Services.  Our custom research efforts serve companies that are seeking to demonstrate the value of their advertising propositions. For example, we have provided custom research services for subscribers including sports play-by-play broadcasters, digital out-of-home and place-based media companies, and cable multiple system operators. The comScore Arbitron Online Radio Ratings is a custom service jointly developed by us and comScore Networks Inc. that measures the national audience of online radio networks. Through our custom research services, we are also exploring applications of PPM data, including nonratings programming, marketing and out-of-home services for broadcast television and cable television. We are also exploring providing services for mobile media and companies that sell advertising on in-store (retail) media.

On February 25, 2008 we announced that Arbitron and Nielsen, as sole members, had agreed to the termination of Project Apollo, LLC (“Project Apollo”). The members have agreed that the winding down of the business and liquidation of the net assets of Project Apollo will occur during the next several months. Project Apollo was formed to explore the commercialization of a national marketing research service created by Arbitron and Nielsen with the objective of providing multimedia exposure data combined with sales data from a single source to produce a measure of advertising effectiveness. From April 2005, Arbitron and Nielsen shared costs and capital expenditures associated with Project Apollo.

ACNielsen (US) Inc., an affiliate of Nielsen, had entered into an agreement with Project Apollo to permit Project Apollo to use its Homescan Panel and certain other data and recruit panelists, tabulate data, and provided related services. We had entered into an agreement with Project Apollo under which we licensed to it PPM technology and equipment and provide other data collection and transmission services. Because of the mutual decision to terminate Project Apollo, neither party will incur early termination penalties. Although the plan for the winding down and liquidation of Project Apollo has not been finalized, we currently estimate that those expenses in 2008 will be approximately $2.0 million to $3.0 million. During the year ended December 31, 2007, we incurred approximately $6.9 million of net expenditures relating to the national marketing research service.

Portable People Meter.  See “Item I. Business — Portable People Meter — International” for more information.

India.  We have formed an entity organized under the laws of India, which entity’s primary function is to oversee outsourced software development in India. Our India operations are currently not a material part of our business.

CSW Research Limited (“Continental Research”).  Through our Continental Research subsidiary, during 2007 we provided custom research services to media, advertising, business-to-business, public sector, telecommunications and Internet research industries in the United Kingdom and elsewhere in Europe.

On January 31, 2008, the Continental Research business was sold. Additional information regarding the sale is provided in Note 3 in the Notes to Consolidated Financial Statements contained in this Annual Report on Form 10-K. We classified the assets, liabilities and results of operations of Continental Research as a discontinued operation held-for-sale for all of the periods presented in the Consolidated Financial Statements contained in this Annual Report on Form 10-K.

Our leading strategic objectives include growing our radio audience measurement business and expanding our information services to a broader range of media, including broadcast television, cable, out-of-home media, satellite radio and television, Internet broadcasts and mobile media. Key elements of our strategy to pursue these objectives include:

Our customers are primarily radio stations, radio networks, cable companies, advertising agencies and corporate advertisers. As of December 31, 2007, we provided our radio audience measurement and related services to approximately 4,500 radio stations and 2,200 advertising agencies and advertisers nationwide under contracts that generally vary in length from one to seven years. As of December 31, 2007, we provided our qualitative measurement and related services to 61 cable systems and 86 out-of-home media customers. One customer, Clear Channel, represented approximately 19 percent of our revenue in 2007. The consolidation of U.S. radio broadcasters has increased the concentration of our customer base. Although this consolidation could put pressure on the pricing of our radio ratings service, it has also contributed to an increase in the number of stations subscribing to the ratings service, as stations have become our customers upon their acquisition by larger broadcasting groups. It has also been our experience that stations that are part of larger broadcasting groups are somewhat more likely to purchase our analytical software applications and other services in addition to the Radio Market Report. Furthermore, we believe that we are well positioned to provide new products and services to meet the emerging needs of broadcasting groups.

We market our products and services in the U.S. through a direct sales force that consisted of 63 sales account managers and 43 training service consultants, as of December 31, 2007.

We have entered into a number of agreements with third parties to assist in marketing and selling our products and services in the U.S. For example, Marketron International, Inc., distributes, on an exclusive basis, our Qualitap software to television and cable outlets in the U.S.

We support our sales and marketing efforts through the following:

Television.  We provide our cable television network, multiple system operator and local cable system customers with detailed consumer information data and services at a national, regional and local level through our partnership with Scarborough. We believe this information is widely used in the cable marketplace as a complement to quantitative currency ratings. We market this consumer data primarily for use by our customers in advertising sales and marketing to provide audience metrics beyond the typical age, gender consumer demographic data, as well as for gaining a clearer picture of the retail behavior of cable television audiences. In addition, we market custom research services and solutions to the broadcast and cable television marketplace. We provide sample studies as well as innovative research solutions utilizing our PPM service to these customers. Both sample studies and passive electronic measurement solutions help customers gain a better understanding of how television audiences interact with and consume different media and particular vehicles within each medium. Many television stations also license our radio data for purposes of in-house media advertising planning and buying.

Out-of-Home Services.  We market our consumer information, sales training programs and custom research solutions to a variety of out-of-home media companies. The diverse out-of-home customer base includes traditional billboard companies as well as new and emerging “place-based” media in locations such as malls, retail stores, airports and cinemas. Traditional out-of-home companies use our Scarborough local market consumer data as primary sales tools. We believe these companies also take advantage of our suite of training services to help increase their sales. For new media, we offer in-depth case studies documenting the awareness, acceptance, engagement and effectiveness of these new media choices. In addition, we utilize our passive electronic measurement technologies to provide new services that demonstrate accountability for these media, including continuously measured audience estimates, proof-of-play and compliance documentation. Together, these services allow us to assist out-of-home media companies and their advertisers to identify and reach their target audiences and secure greater shares of the advertising dollar.

We believe that the principal competitive factors in our markets are the credibility and reliability of the audience research, the ability to provide quality analytical services for use with the audience information and the end-user experience with services and price.

We are a leader in the radio audience measurement business in the United States. We compete in the radio audience measurement business in some small U.S. markets with Eastlan Resources, a privately held research company. We are also aware of at least seven companies, Nielsen, Liechti AG/Telecontrol AG, GfK AG, The Media Audit (a division of International Demographics, Inc.), Ipsos SA, Thompson Electronics Ltd. and AGB Nielsen (a joint venture between AGB Group (a division of Kantar Media) and Nielsen), that are developing technologies that could compete with our PPM service.

We compete with a large number of other providers of applications software, qualitative data and proprietary qualitative studies used by broadcasters, cable companies, advertising agencies, advertisers, and out-of-home media companies. These competitors include STRATA Marketing Inc., Telmar Information Services Corp., Marketron

Our intellectual property is, in the aggregate, of material importance to our business. A combination of patents, copyrights, trademarks, service marks, trade secret laws, license agreements, confidentiality procedures and other contractual restrictions, are relied upon to establish and protect proprietary rights in our products and services. As of December 31, 2007, 28 U.S. patents were issued and 48 U.S. patent applications were pending on behalf of Arbitron. Internationally, 82 foreign patents were issued and 121 foreign patent applications were pending. Our patents relate to our data collection, processing systems, software and hardware applications, the PPM and its methods, and other intellectual property assets. Several patents relating to the PPM and its methods expire at various times beginning in 2012 and collectively are of material importance to our business.

Our audience listening estimates are original works of authorship protectable under U.S. copyright laws. We publish the Radio Market Report either quarterly or semiannually, depending on the Arbitron market surveyed, while we publish the Radio County Coverage Report annually. We seek copyright registration for each Radio Market Report and for each Radio County Coverage Report published in the United States. We also seek copyright protection for our proprietary software and for databases comprising the Radio Market Report and other services containing our audience estimates and respondent-level data. Prior to the publication of our reports and release of the software containing the respondent-level data, we register our databases under the U.S. federal copyright laws. We generally provide our proprietary data regarding audience size and demographics to customers through multiyear license agreements.

We market a number of our services under U.S. federally registered trademarks that are helpful in creating brand recognition in the marketplace. Some of our registered trademarks and service marks include: the Arbitron name and logo, Maximi$er, RetailDirect and RADAR. The Arbitron name and logo is of material importance to our business. We have a trademark application pending for Arbitron PPM. We also have a number of common-law trademarks, including Media Professional, Qualitap, MediaMaster and Prospector. We have registered our name as a trademark in the United Kingdom, Mexico, the European Union, Australia, Singapore, Chile and Japan, and are exploring the registration of our marks in other foreign countries.

The laws of some countries might not protect our intellectual property rights to the same extent as the laws of the United States. Effective patent, copyright, trademark and trade secret protection may not be available in every country in which we market or license our data and services.

We believe our success depends primarily on the innovative skills, technical competence, customer service and marketing abilities of our personnel. We enter into confidentiality and assignment-of-inventions agreements with substantially all of our employees and enter into nondisclosure agreements with our suppliers and customers to limit access to and disclosure of our proprietary information.

We must protect against the unauthorized use or misappropriation of our audience estimates, databases and technology by third parties. There can be no assurance that the copyright laws and other statutory and contractual arrangements we currently depend upon will provide us sufficient protection to prevent the use or misappropriation of our audience estimates, databases and technology in the future. The failure to protect our proprietary information, intellectual property rights and, in particular, our audience estimates and databases could severely harm our business.

Additionally, claims by third parties that our current or future products or services infringe upon their intellectual property rights may harm our business. Intellectual property litigation is complex and expensive, and the outcome of this litigation is difficult to predict. We have been involved in litigation relating to the enforcement of our copyrights covering our radio listening estimates and patents covering our proprietary technology. Although we have generally been successful in these cases, there can be no assurance that the copyright laws and other statutory and contractual arrangements we currently depend upon will provide us sufficient protection to prevent the use or misappropriation of our audience estimates, databases and technology in the future. Litigation, regardless of outcome, may result in substantial expense and a significant diversion of our management and technical personnel. Any adverse determination in any litigation may subject us to significant liabilities to third parties, require us to

Our research and development activities have related primarily to the development of new products and customer software and other technical expenses, including maintenance of legacy operations and reporting systems. We expect that we will continue research and development activities on an ongoing basis, particularly in light of the rapid technological changes affecting our business. We expect that the majority of the investment effort and spending will be dedicated to improving the overall quality and efficiency of our data collection and processing systems, developing new software applications that will assist our customers in realizing the full potential of our audience measurement services, developing our PPM technology and developing a single-source service that will be able to measure audience and other information from a number of different forms of media. Research and development expenses during fiscal years 2007, 2006 and 2005 totaled $42.5 million, $44.2 million, and $38.4 million, respectively.

Our PPM equipment has been certified to meet Federal Communications Commission requirements relating to emissions standards and standards for modem connectivity. Additionally, all PPM equipment has been certified to meet the safety standards of Underwriters Laboratories Inc. (commonly referred to as UL), as well as Canadian and European safety and environmental standards.

Our media research activities are regulated by the United States Federal Trade Commission in accordance with a Decision and Order issued in 1962 to CEIR, Inc., a predecessor company. This order originally arose in connection with a television ratings business, and we believe that today it applies to our media measurement services. The order requires full disclosure of the methodologies we use and prohibits us from making representations in selling or offering to sell an audience measurement service without proper qualifications and limitations regarding probability sample, sampling error and accuracy or reliability of data. It prohibits us from making statements that any steps or precautions are taken to ensure the proper maintenance of diaries unless such steps or precautions are in fact taken. It also prohibits us from making overly broad statements regarding the media behavior a survey reflects. The order further prohibits us from representing the data as anything other than estimates and from making a statement that the data are accurate to any precise mathematical value. The order requires that we make affirmative representations in our reports regarding nonresponse by survey participants and the effect of this nonresponse on the data, the hearsay nature of a survey participant’s response, the fact that projections have been made, and the limitations and deficiencies of the techniques or procedures used. We believe that we have conducted and continue to conduct our radio audience measurement services in compliance with the order.

Our diary-based Radio Market Report Service is accredited by and subject to the review of the MRC, an industry organization created to ensure high ethical and operational standards in audience measurement research. The MRC has accredited our diary-based Radio Market Report Service since 1968. The MRC accredited our PPM radio and television ratings data in the Houston-Galveston local market on January 29, 2007. Additional Arbitron services that are accredited by the MRC are RADAR, Maximi$er and Media Professional software, the Custom Survey Area Report (“CSAR”) and the Radio County Coverage services. To merit continued accreditation of our services, we must: (1) adhere to the MRC’s minimum standards for Media Rating Research; (2) supply full information to the MRC regarding details of our operations; (3) conduct our media measurement services substantially in accordance with representations to our subscribers and the MRC; (4) submit to, and pay the cost of, thorough annual audits of our accredited services by certified public accounting firms engaged by the MRC; and (5) commit to continuous improvement of our media measurement services.

Federal and state regulations restrict telemarketing to individuals who request to be included on a do-not-call list. Currently, these regulations do not apply to survey research, but there can be no assurance that these regulations will not be made applicable to survey research in the future. In addition, federal regulations prohibit calls made by autodialers to wireless lines without consent from the subscriber. Because consumers are able to transfer a wireless number to a landline carrier or a landline number to a wireless carrier, it can be difficult for us to efficiently identify wireless numbers in advance of placing an autodialed call.

As of December 31, 2007, we employed 1,092 people on a full-time basis and 528 people on a part-time basis in the United States. None of our employees is covered by a collective bargaining agreement. We believe our employee relations are good.

We recognize revenue for services over the terms of license agreements as services are delivered, and expenses are recognized as incurred. We gather radio-listening data in approximately 300 U.S. local markets. All markets are measured at least twice per year (April-May-June for the “Spring Survey” and October-November-December for the “Fall Survey”). In addition, we measure all major markets two additional times per year (January-February-March for the “Winter Survey” and July-August-September for the “Summer Survey”). Our revenue is generally higher in the first and third quarters as a result of the delivery of the Fall Survey and Spring Survey, respectively, to all markets, compared to revenue in the second and fourth quarters, when delivery of the Winter Survey and Summer Survey, respectively, is made only to major markets. Our expenses are generally higher in the second and fourth quarters as the Spring Survey and Fall Survey are being conducted.

The transition from the diary service to the PPM service in the top 50 U.S. radio markets will have an impact on the seasonality of revenue and costs and expenses. Although revenue in the top 50 U.S. radio markets is recognized ratably over the year in both the diary and PPM services, there will be fluctuations in the depth of the seasonality pattern during the periods of transition between the services in each market. The larger impact on the seasonality pattern is related to the costs and expenses to produce the services. PPM costs and expenses will accelerate six to nine months in advance of the commercialization of each market as the panel is built. These increased costs will be recognized as incurred rather than upon the delivery of a particular quarterly survey, and will vary from the cost pattern associated with the delivery of the diary service.

Scarborough experiences losses during the first and third quarters of each year because revenue is predominantly recognized in the second and fourth quarters when the substantial majority of services are delivered. Scarborough royalty costs, which are recognized in costs of revenue, are also higher during the second and fourth quarters.

Our Web site address is www.arbitron.com, and interested persons may obtain, free of charge, copies of filings (including our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to those reports) that we have made with the Securities and Exchange Commission through a hyperlink at this site to a third-party Securities and Exchange Commission filings Web site (as soon as reasonably practicable after such filings are filed with, or furnished to, the Securities and Exchange Commission). The Securities and Exchange Commission maintains an Internet site that contains our reports, proxy and information statements, and other information. The Securities and Exchange Commission’s Web site address is www.sec.gov. Also available on our Web site are our Corporate Governance Policies and Guidelines, Code of Ethics for the Chief Executive Officer and Financial Managers, Code of Ethics and Conduct, the Audit Committee Charter, the Nominating and Corporate Governance Committee Charter, the Compensation and Human Resources Committee Charter, and the Charter of the Lead Independent Director. Copies of these documents are also available in print, free of charge, to any stockholder who requests a copy by contacting our treasury manager.

On May 31, 2007, we submitted the annual certification of our chief executive officer to the New York Stock Exchange (the “NYSE”) certifying that he is not aware of any violation by the Company of the NYSE’s corporate governance listing standards, pursuant to Section 303A.12 of the NYSE Listed Company Manual. In addition, on August 29, 2007, our Board of Directors voted to combine the Nominating Committee and Corporate Governance Committee into a single, newly-formed, Nominating and Corporate Governance Committee composed entirely of independent directors. See the Current Report on Form 8-K filed with the SEC on August 29, 2007, for a description of the election of David W. Devonshire to our Board of Directors. We delivered an interim written affirmation to the NYSE on September 4, 2007 following the election of Mr. Devonshire to our Board of Directors, resulting in a change in the membership of our Audit Committee.

Our business, financial position and operating results are dependent on the performance of our quantitative radio audience measurement business.

Our quantitative radio audience measurement service and related software sales represented 79 percent and nine percent, respectively, of our total revenue for 2007. We expect that such sales related to our radio audience measurement business will continue to represent a substantial portion of our revenue for the foreseeable future. Any factors adversely affecting the pricing of, demand for, or market acceptance of our quantitative radio audience measurement service and related software, such as competition, technological change, or further ownership shifts in the radio industry, could adversely impact our business, financial position and operating results.

If our PPM ratings service does not generate the revenues that we anticipate, or if our ability to earn such revenues is delayed, our financial results will suffer.

Commercialization of the PPM service is an essential component of our anticipated future growth, which we expect will result in increased revenues in the coming years. On November 26, 2007, we announced our decision to delay commercialization of the PPM ratings service in nine markets and, therefore, updated our previously announced schedule to roll out the PPM ratings service to the top 50 U.S. radio markets by 2010.

Our financial results during 2008 and beyond will depend in substantial part on our success in commercializing the PPM ratings service, and other new initiatives, and our ability to generate meaningful revenues from them. If our commercialization of the PPM service is further delayed, expected revenue increases will also be delayed and our financial results will be materially negatively impacted. Factors that may affect the pace of the commercialization of our PPM ratings service, and as a result, our future revenues or operating results include the following, some of which are beyond our control:

We may be required to expend significant additional resources in order to obtain MRC accreditation for our local market PPM radio ratings services, which could adversely impact our business.

The MRC has accredited the PPM ratings service in the Houston-Galveston local market only. In January 2008, the MRC denied accreditation of the Philadelphia and New York local market PPM ratings services. If the efforts required to obtain MRC accreditation in Philadelphia or New York are substantially in excess of our current expectations, or if we are required to make significant changes with respect to methodology and panel composition and management in order to establish that the service meets or exceeds the MRC accreditation standards in any future local market, we may be required to make expenditures, the amount of which could be material.

Criticism of our audience measurement service by various government entities, industry groups, and market segments could adversely impact our business.

Due to the high-profile nature of our services in the media and marketing information service industry, we could become the target of additional government regulation, legislation, litigation, activism or negative public relations efforts by various industry groups and market segments. We believe that any of the foregoing, criticism of our methodology or negative perception of the quality of our research could further delay the PPM rollout schedule or negatively impact industry confidence in the ratings we produce, which could require us to make expenditures substantially in excess of our current expectations in an attempt to maintain such confidence.

We have limited experience designing, recruiting and maintaining PPM panels. If we are unable to design, recruit and maintain PPM panels that appropriately balance research quality, panel size and operational cost, our financial results will suffer.

The commercial viability of many of our new business initiatives, including our quantitative radio audience measurement service, are dependent on our ability to design, recruit and maintain panels of persons to carry our Portable People Meters, and to ensure appropriate panel composition to accommodate a broad variety of media research services. Our research methodologies require us to maintain panels of reasonably sufficient size and reasonably representative demographic composition. Our research methodologies also require our panelists to comply with certain standards, such as carrying the meter for a minimum number of hours each day and docking the meter daily, in order for us to use the data collected by the meter in estimating ratings.

Participation in a PPM panel requires panelist households to make a longer term commitment than participation in our diary-based ratings service. Designing, recruiting and maintaining PPM panels is substantially different than recruiting participants for our diary-based ratings service. We have limited experience in operating such PPM panels and we may encounter unanticipated difficulties as we attempt to do so. Without historical benchmarks on key sample performance metrics, it will be challenging for us to maintain the appropriate balance of research quality, panel size and operational costs. Designing, recruiting, and maintaining such panels may also cause us to incur expenses substantially in excess of our current expectations.

If we are unable to successfully design, recruit and maintain such PPM panels, or if we are required to incur expenses substantially in excess of our current expectations in order to do so, it could adversely impact our ability to obtain and/or maintain MRC accreditation of our PPM service or otherwise adversely impact our business, financial position and operating results.

We expect to invest in the continued development and commercialization of our PPM ratings service, which may not ultimately be successfully commercialized. The costs associated with commercialization of this service will adversely impact our operating results over the commercialization period.

The continuing commercialization of the PPM ratings service requires and will continue to require significant capital resources and a substantial financial investment over the next several years. We currently estimate that the annual capital expenditures associated with PPM ratings service commercialization for audience ratings measurement will be approximately $20.0 million. We also anticipate that, over the first two to three years of commercialization, our results of operations will be materially negatively impacted as a result of the rollout of our PPM ratings service.

The amount of capital required for deployment of our PPM ratings service and the impact on our results of operations will be greatly affected by the speed of the rollout schedule. While commercialization of our PPM ratings service will have a near-term negative impact on our results of operations, which impact likely will be material, restoration of our operating margins following the completion of the PPM transition process in the top 50 U.S. radio markets remains our goal, although there can be no assurance that this will be the case.

The success of commercialization of the PPM ratings service is dependent on manufacturers who produce the PPM equipment according to our proprietary design as well as those who manufacture parts.

We will need to purchase equipment used in the PPM ratings service and we are currently dependent on one manufacturer to produce our PPM equipment. The equipment must be produced by the manufacturer in a timely manner, in the quantities needed and with the quality necessary to function appropriately in the market. Certain specialized parts used in the PPM equipment may impact the manufacturing and the timing of the delivery of the equipment to us. We may become liable for design or manufacturing defects in the PPM equipment. In addition, if countries and states enact additional regulations limiting certain materials, we may be required to redesign some of our PPM components to meet these regulations. A redesign process, whether as a result of changed environmental regulations or our ability to obtain quality parts, may impact the manufacturing and timing of the delivery of the equipment to us. Our failure to obtain, in a timely manner, sufficient quantities of quality equipment to meet our needs could adversely impact the commercial deployment of the PPM ratings service and therefore could adversely impact our operating results.

Technological change may render our products and services obsolete and it may be difficult for us to develop new products and services or enhance existing ones.

We expect that the market for our products and services will be characterized by changing technology, evolving industry standards, frequent new product and service announcements and enhancements and changing customer demands. The introduction of new products and services incorporating new technologies and the emergence of new industry standards could render existing products and services obsolete and/or challenge current accepted levels of precision of data measurement. Additionally, advertising-supported media may be challenged by new technologies that could have an effect on the advertising industry, our customers, and our products and services. Our continued success will depend on our ability to adapt to changing technologies and to improve the performance, features and reliability of our products and services in response to changing customer and industry demands. We may experience difficulties that could delay or prevent the successful design, development, testing, introduction or marketing of our products and services. Our new products and services, such as our PPM service, or enhancements to our existing products and services, may not adequately meet the requirements of our current and prospective customers or achieve any degree of significant market acceptance. Our inability to successfully adapt to changing technologies and customer demands, either through the development and marketing of new products and services, or through enhancements to our existing products and services, could adversely impact our business, financial position and results of operations.

The loss of a key customer would significantly reduce our revenue and operating results.

In 2007, Clear Channel represented approximately 19 percent of our revenue. Several other large customers represented significant portions of our 2007 revenue.

On June 26, 2007, we entered into a new multiyear agreement with Clear Channel to provide PPM radio ratings and other related services to Clear Channel’s 268 radio stations located in the 46 markets in which Clear Channel operates out of the 50 markets identified in our previously announced PPM roll-out plan (we refer to the 46 markets in which Clear Channel operates that are included in the PPM roll-out plan, collectively, as the “Clear Channel PPM Markets”). Pursuant to the terms of the agreement, we will provide Clear Channel with PPM ratings services, as and when the new audience ratings technology is deployed in the Clear Channel PPM Markets. Until such time as the PPM ratings technology is deployed in a particular market, we will continue to provide Clear Channel with our diary-based ratings services in that market. As the PPM ratings technology is deployed in a particular market, the diary-based ratings agreement will lapse and the new agreement will become applicable to such market. The new agreement also extends the diary-based ratings agreement in the Clear Channel PPM Markets that do not enter into PPM measurement prior to December 31, 2008, until such time as the PPM service is commercialized in those markets, but not later than December 31, 2011. The existing agreement between Clear Channel and us for diary-based ratings in markets outside of the Clear Channel PPM Markets was not amended by the new agreement and is currently scheduled to expire December 31, 2008.

We cannot provide any assurances that we could replace the revenue that would be lost if a key customer failed to renew all or part of its agreements with us. The loss of a key customer would materially impact our business, financial position and operating results.

Ownership shifts in the radio broadcasting industry may put pressure on the pricing of our quantitative radio audience measurement service and related software sales, thereby leading to decreased earnings growth.

Ownership shifts in the radio broadcasting industry could put pressure on the pricing of our quantitative radio audience measurement service and related software sales, from which we derive a substantial portion of our total revenue. We price our quantitative radio audience measurement service and related software applications on a per radio station, per service or per product basis, negotiating licenses and pricing with the owner of each radio station or group of radio stations. If we agree to make substantial price concessions, it could adversely impact our business, financial position and operating results.

Our agreements with our customers are not exclusive and contain no renewal obligations. The failure of our customers to renew all or part of their contracts could have an adverse impact on our business, financial position and operating results.

Our customer agreements do not prohibit our customers from entering into agreements with any other competing service provider, and once the term of the agreement (usually one to seven years) expires, there is generally no automatic renewal feature in our customer contracts. Because our diary-based Radio Market Report is delivered on a quarterly or semiannual basis and our PPM-based ratings are delivered on a monthly basis, it is

Long-term agreements with our customers limit our ability to increase the prices we charge for our services if our costs increase.

We generally enter into long-term contracts with our customers, including contracts for delivery of our radio audience measurement services. The term of these customer agreements usually ranges from one to seven years. Over the term of these agreements our costs of providing services may increase, or increase at rates faster than our historical experience. Although our customer contracts generally provide for annual price increases, there can be no assurance that these contractual revenue increases will exceed any increased cost of providing our services, which could have an adverse impact on our business, financial position and operating results.

The success of our radio audience measurement business depends on diarykeepers who record their listening habits in diaries and return these diaries to us and panelists who carry our PPM meter. Our failure to collect these diaries and to recruit compliant participants could adversely impact our business.

We use listener diaries and electronic data gathered from participants who agree to carry our PPM meters to gather radio listening data from sample households in the U.S. local markets for which we currently provide radio ratings. A representative sample of the population in each local market is randomly selected for each survey. This sample is recruited by telephone to keep a diary of their radio listening for one week or to carry a PPM meter for a period of up to two years. To encourage their participation in our surveys, we give participants a cash incentive. It is becoming increasingly difficult and more costly to obtain consent from the phone sample to participate in the surveys, especially among younger demographic groups. We must achieve response rates sufficient to maintain confidence in our ratings, the support of the industry and accreditation by the MRC. Our failure to successfully recruit compliant survey participants could adversely impact our business, financial position and operating results.

Our survey participants do so on a voluntary basis only, and there can be no assurance that they will continue to do so. Our success will depend on our ability to reach and recruit participants and to achieve response rates sufficient to maintain our radio audience measurement services. As consumers adopt modes of telecommunication other than telephone landlines, such as mobile phones and cable or Internet calling, it is becoming increasingly more difficult for us to reach and recruit participants. Recruiting mobile-phone-only households will lead to significantly increased costs, which could adversely impact our business, financial position and operating results.

Our ability to recruit participants for our surveys could be adversely impacted by governmental regulations.

We believe there is an increasing concern among the American public regarding privacy issues. Federal and state regulations restrict telemarketing to individuals who request to be included on a do-not-call list. Currently, these regulations do not apply to survey research. If these laws and regulations are extended to include survey research, our ability to recruit participants for our surveys could be adversely impacted. We are evaluating alternatives to our current methodology, including using panels for our surveys and recontacting previous consenters. In addition, federal regulations prohibit calls made by autodialers to wireless lines without consent from the subscriber. Because consumers are able to transfer a wireless number to a landline carrier or a landline number to a wireless carrier, it can be difficult for us to identify wireless numbers in advance of placing an autodialed call. We are using the services of a third-party supplier that tracks wireless numbers to help identify wireless numbers in our telephone sample, but there can be no assurance that all transfers of numbers are captured.

The license of enhanced access to our respondent-level data to third-party data processors and customers could adversely impact the sale of some of our existing software products.

We have begun offering third-party data processors and certain customers licenses that allow enhanced access to our proprietary respondent-level database. Previously, limited access to our respondent-level data was available only to those customers who licensed certain software services directly from us. As we begin licensing enhanced access to the respondent-level data, sales of our existing software services may be adversely impacted.

Our success will depend on our ability to protect our intellectual property rights.

We believe that the success of our business will depend, in part, on:

We rely on a combination of contractual provisions, confidentiality procedures and patent, copyright, trademark, service mark and trade secret laws to protect the proprietary aspects of our technology, data and estimates. Several patents related to our PPM service, which expire at various times beginning in 2012, when viewed together, are of material importance to us. These legal measures afford only limited protection, and competitors may gain access to our intellectual property and proprietary information. Litigation may be necessary to enforce our intellectual property rights, to protect our trade secrets and to determine the validity and scope of our proprietary rights. We have been involved in litigation relating to the enforcement of the copyrights covering our radio listening estimates. Although we have generally been successful in these cases, there can be no assurance that the copyright laws and other statutory and contractual arrangements we currently depend upon will provide us sufficient protection to prevent the use or misappropriation of our audience estimates, databases and technology in the future. Litigation, regardless of outcome, could result in substantial expense and a significant diversion of resources with no assurance of success and could adversely impact our business, financial position and operating results.

We are dependent on our proprietary software systems for current and future business requirements. Significant delays in the completion of these systems, cost overages and/or inadequate performance of the systems once completed could adversely impact our business, financial position and operating results.

Our current systems do not have the capability to accommodate all additional product enhancements requested by our clients. We are engaged in a major effort to upgrade, enhance, and, where necessary, replace our internal processing software and our client software. Significant delays in the completion of these systems, cost overages and/or inadequate performance of the systems, once completed, could adversely impact our business, financial position and operating results.

Our future growth and success will depend on our ability to successfully compete with companies that may have financial, marketing, distribution, technical and other advantages over us.

We compete with many companies, some of which are larger and have access to greater capital resources. We believe that our future growth and success will depend on our ability to successfully compete with other companies that provide similar services in the same markets, some of which may have marketing, technical and other advantages. We cannot provide any assurance that we will be able to compete successfully, and the failure to do so could have a material adverse impact on our business, financial position and operating results.

An economic downturn generally, and in the advertising and radio industries in particular, could adversely impact our revenue.

Our clients derive most of their revenue from transactions involving the sale or purchase of advertising. During challenging economic times, advertisers may reduce advertising expenditures, impacting advertising agencies and media. As a result, advertising agencies and media may be less likely to purchase our media information services, which could adversely impact our business, financial position and operating results.

Advertisers are pursuing increased accountability from the media industry for their return on investments made in media.

Advertisers may shift advertising expenditures away from media that they perceive as less accountable, such as radio. As a result, advertising agencies and radio stations may be less likely to purchase our media information services, which could have an adverse impact on our business, financial position and operating results.

We rely on third parties to provide data and services in connection with our current business and we may require additional third-party data and services to expand our business in the future.

In the event that third-party data and services are unavailable for our use or are not available to us on favorable terms, our business could be adversely impacted. Further, in order for us to build on our experience in the radio audience measurement industry and expand into measurement for other types of media, we may need to enter into agreements with third parties. Our inability to enter into these agreements with third parties at all or upon favorable terms, when necessary, could adversely impact our growth and business.

Long-term disruptions in the mail, telecommunication infrastructure and/or air service could adversely impact our business.

Our business is dependent on the use of the mail, telecommunication infrastructure and air service. Long-term disruptions in one or more of these services, which could be caused by events such as natural disasters, the outbreak of war, the escalation of hostilities and/or acts of terrorism could adversely impact our business, financial position and operating results.

On December 20, 2006, we entered into a five-year, $150.0 million revolving credit facility that contains financial terms, covenants and operating restrictions that could restrict our financial flexibility and could adversely impact our ability to conduct our business. These include:

These restrictions may limit or prohibit our ability to raise additional debt capital when needed or could prevent us from investing in other growth initiatives. Our ability to comply with these financial requirements and other restrictions may be affected by events beyond our control, and our inability to comply with them could result in a default under the terms of the agreement.

If a default occurs, either because we are unable to generate sufficient cash flow to service the debt or because we fail to comply with one or more of the restrictive covenants, the lenders could elect to declare all of the then-outstanding borrowings, as well as accrued interest and fees, to be immediately due and payable. In addition, a default may result in the application of higher rates of interest on the amounts due, resulting in higher interest expense being incurred by us.

Changes in market conditions, or sales of our common stock, could adversely impact the market price of our common stock.

The market price of our common stock depends on various financial and market conditions, which may change from time to time and which are outside of our control.

Sales of a substantial number of shares of our common stock, or the perception that such sales could occur, also could adversely impact prevailing market prices for our common stock. In addition to the possibility that we may sell shares of our common stock in a public offering at any time, we also may issue shares of common stock in connection with grants of restricted stock or upon exercise of stock options that we grant to our directors, officers and employees. All of these shares will be available for sale in the public markets from time to time.

It may be difficult for a third party to acquire us, which could depress the stock price of our common stock.

Delaware corporate law and our Amended and Restated Certificate of Incorporation and Bylaws contain provisions that could have the effect of delaying, deferring or preventing a change in control of Arbitron or the removal of existing management or directors and, as a result, could prevent our stockholders from being paid a premium for their common stock over the then-prevailing market price. These provisions could also limit the price that investors might be willing to pay in the future for shares of our common stock. These include:

Our Amended and Restated Certificate of Incorporation also contains the following provisions, which could prevent transactions that are in the best interest of stockholders:

None.

Our primary locations are in Columbia, Maryland, and our headquarters are located at 142 West 57th Street, New York, New York. Our New York City office serves as our home base for sales and marketing, while our survey research, technology and data collection/production operations are located in our Columbia, Maryland, facilities. In addition, we have five regional sales offices located in the metropolitan areas of Atlanta, Georgia; Washington, DC/Baltimore, Maryland; Chicago, Illinois; Dallas, Texas; and Los Angeles, California; and operations offices in Dallas, Texas; Houston, Texas; Cranford, New Jersey; Birmingham, Alabama; and Indianapolis, Indiana. We conduct all of our operations in leased facilities. Most of these leases contain renewal options and require payments for taxes, insurance and maintenance in addition to base rental payments. We believe that our facilities are sufficient for their intended purposes and are adequately maintained.

During 2005, the Pennsylvania Department of Revenue concluded a sales tax audit and notified us of an assessment of $3.6 million, including outstanding sales tax and accumulated interest since 2001. Consistent with the findings of a previous Pennsylvania sales tax audit, we contended that we provided nontaxable services to our Pennsylvania customers. In an effort to avoid protracted litigation and the related costs, we offered a settlement in the amount of $0.3 million, which was accepted by the Office of Attorney General in 2007.

On October 10, 2006, we filed a patent infringement lawsuit against International Demographics, Inc. (D/B/A The Media Audit), Ipsos Group S.A., Ipsos ASI, Inc., Ipsos America, Inc. aka Ipsos North America and Ipsos Media (collectively “the Ipsos entities”) in the United States District Court for the Eastern District of Texas. The complaint alleges that International Demographics and the Ipsos entities are infringing three patents that we own, United States Patents No. 5,787,334, No. 5,574,962 and No. 5,483,276, each relating to electronic audience measurement technology. In our suit, we seek a permanent injunction against International Demographics and the Ipsos entities, in addition to adequate compensatory damages as determined by the court.

We are involved from time to time in a number of judicial and administrative proceedings considered ordinary with respect to the nature of our current and past operations, including employment-related disputes, contract disputes, government proceedings, customer disputes and tort claims. In some proceedings, the claimant seeks damages as well as other relief, which, if granted, would require substantial expenditures on our part. Some of these matters raise difficult and complex factual and legal issues, and are subject to many uncertainties, including, but not limited to, the facts and circumstances of each particular action, and the jurisdiction, forum and law under which

We did not submit any matters to a vote of our stockholders during the fourth quarter of 2007.

Our common stock is listed on the New York Stock Exchange (“NYSE”) under the symbol “ARB.” As of February 15, 2008, there were 28,312,760 shares outstanding and 6,179 stockholders of record of our common stock.

The following table sets forth the high and low sale prices of our common stock as reported on the NYSE Composite Tape and the dividends declared per share of its common stock for each quarterly period for the past two years ended December 31, 2007 and 2006.

The transfer agent and registrar for our common stock is The Bank of New York.

On November 16, 2006, we announced that our Board of Directors authorized a program to repurchase up to $100.0 million of our outstanding common stock through either periodic open-market or private transactions at then-prevailing market prices over a period of up to two years. As of October 19, 2007, the program was completed with 2,093,500 shares being repurchased for an aggregate purchase price of approximately $100.0 million. On November 15, 2007, our Board of Directors authorized a program to repurchase up to $200.0 million of our outstanding common stock in like manner through November 14, 2009. Under this program, no shares of outstanding common stock had been purchased as of February 15, 2008.

The selected financial data set forth below should be read together with the information under the heading “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Arbitron’s

Certain per share data amounts may not total due to rounding.

We adopted the provisions of Statement of Financial Accounting Standards (“SFAS”) No. 123R, Share-Based Payments (“SFAS No. 123R”) as of January 1, 2006. Share-based compensation expense for each of the years ended December 31, 2007 and 2006 was $6.5 million. Share-based awards were previously accounted for under Accounting Principles Board (“APB”) opinion No. 25, Accounting for Stock Issued to Employees (“APB No. 25”). See Notes 2 and 16 to the Notes to the Consolidated Financial Statements for further discussion and analysis.

The following discussion should be read in conjunction with our consolidated financial statements and the notes thereto that follow in this Annual Report on Form 10-K.

Historically, our quantitative radio audience measurement services and related software have accounted for a substantial majority of our revenue. Our radio audience measurement services and related software revenues represented 79 percent and nine percent, respectively, of our total revenue in both 2007 and 2006. While we expect that our quantitative radio audience measurement services and related software will continue to account for the majority of our revenue for the foreseeable future, we are actively seeking opportunities to diversify our revenue base by, among other things, leveraging the investment we have made in our PPM technology by increasing the international licensing and exploring applications of the technology beyond our radio audience measurement business. We expect to continue our efforts to diversify revenue.

In 2007 and 2006 we entered into multi-year agreements with many of our largest customers, including agreements for PPM-based ratings as and when we commercialize the PPM service in the top 50 U.S. radio markets. These agreements generally provide for a higher license fee for PPM-based ratings than we charge for diary-based ratings. As a result, we expect that the percentage of our revenues derived from our radio audience measurement and related software is likely to increase as we commercialize the PPM service.

Due to slow economic growth of the radio industry generally, as well as the high penetration of our current services in the radio station business, we expect that our future annual organic rate of revenue growth from our quantitative diary-based radio measurement services and related software will be slower than historical trends. We anticipate that in the near term, organic revenue growth will only moderately exceed the level of contractual price escalators in our diary-based radio ratings contracts.

Concentration of ownership of radio stations in recent years has led to our increased dependence on a limited number of key customers for such services and related software. For example, in 2007, Clear Channel represented 19 percent of our total revenue. Because many of our largest customers own and operate radio stations in markets that we expect to transition to PPM measurement, we expect that our dependence on our largest customers will continue for the foreseeable future.

We have begun execution of our previously announced plan to roll out progressively our PPM ratings service to the top 50 U.S. radio markets by the end of 2010. Commercialization of our PPM ratings service requires, and we expect will continue to require a substantial financial investment. While commercialization of the PPM ratings service will have a near-term negative impact on our results of operations, which impact likely will be material, restoration of our operating margins following completion of the PPM transition process in the top 50 U.S. radio markets remains our goal, although there can be no assurance that this will be the case. Because many of our largest customers have committed to PPM-based ratings, we also expect that much of our management focus in 2008 will be on continuously improving and successfully commercializing our PPM ratings service. We anticipate that we will incur additional costs in 2008 related to new initiatives to improve the PPM service.

We continue to operate in a highly challenging business environment in the markets and industries we serve. Our performance will be impacted by our ability to address a variety of challenges and opportunities in these markets and constituencies, including our ability to continue to maintain and improve both our diary service and our PPM service, design and recruit PPM panels that appropriately balance research quality, panel size, and operational cost, and develop and implement technological solutions to measure multi-media and advertising.

On November 16, 2006, we announced that our Board of Directors authorized a program to repurchase up to $100.0 million of its outstanding common stock through either periodic open-market or private transactions at then-prevailing market prices over a period of two years through November 2008. As of October 19, 2007, the program was completed with 2,093,500 shares being repurchased for an aggregate purchase price of approximately

See “Item 3. Legal Proceedings” for a description of the Pennsylvania sales tax assessment.

On January 31, 2008, we sold the Continental Research business. Additional information regarding the sale is provided in Note 3 in the Notes to Consolidated Financial Statements contained in this Annual Report on Form 10-K.

On February 25, 2008 we announced that Arbitron and Nielsen, as sole members, had agreed to the termination of Project Apollo. See “Item 1. Business — National Marketing Research Service — Project Apollo.” Although the plan for the winding down and liquidation of Project Apollo has not been finalized, we currently estimate that those expenses in 2008 will be approximately $2.0 million to $3.0 million.

Critical accounting policies and estimates are those that both are important to the presentation of our financial position and results of operations, and require our most difficult, complex or subjective judgments.

We capitalize software development costs with respect to significant internal use software initiatives or enhancements in accordance with Statement of Position 98-1, Accounting for the Costs of Computer Software Developed or Obtained for Internal Use. The costs are capitalized from the time that the preliminary project stage is completed and management considers it probable that the software will be used to perform the function intended, until the time the software is placed in service for its intended use. Once the software is placed in service, the capitalized costs are amortized over periods of three to five years. We perform an assessment quarterly to determine if it is probable that all capitalized software will be used to perform its intended function. If an impairment exists, the software cost is written down to estimated fair value. During the year ended December 31, 2007, we recorded an impairment charge of $0.8 million associated with our Customer Relationship Management system due to the functionality being replaced by a new system. As of December 31, 2007, and 2006, our capitalized software developed for internal use had carrying amounts of $20.9 million and $19.3 million, respectively, including $10.2 million and $9.0 million, respectively, of software related to the PPM service.

We use the asset and liability method of accounting for income taxes. Under this method, income tax expense is recognized for the amount of taxes payable or refundable for the current year and for deferred tax liabilities and assets for the future tax consequences of events that have been recognized in an entity’s financial statements or tax returns. We must make assumptions, judgments and estimates to determine the current provision for income taxes and also deferred tax assets and liabilities and any valuation allowance to be recorded against a deferred tax asset. Our assumptions, judgments, and estimates relative to the current provision for income taxes take into account current tax laws, interpretation of current tax laws and possible outcomes of current and future audits conducted by domestic and foreign tax authorities. Changes in tax law or interpretation of tax laws and the resolution of current and future tax audits could significantly impact the amounts provided for income taxes in the consolidated financial statements. Our assumptions, judgments and estimates relative to the value of a deferred tax asset take into account forecasts of the amount and nature of future taxable income. Actual operating results and the underlying amount and nature of income in future years could render current assumptions, judgments and estimates of recoverable net deferred tax assets. We believe it is more likely than not that we will realize the benefits of these deferred tax assets.

In accordance with FASB Interpretation (“FIN”) 48, Accounting for Uncertainty in Income Taxes (“FIN No. 48”), an interpretation of FASB Statement No. 109, Accounting for Income Taxes, we include, in our tax calculation methodology, an assessment of the uncertainty in income taxes by establishing recognition thresholds for our tax positions before being recognized in the financial statements. Inherent in our calculation are critical judgments by management related to the determination of the basis for our tax positions. FIN No. 48 provides guidance on derecognition, measurement, classification, interest and penalties, accounting in interim periods, disclosure and transition. For further information, see Note 14 in the Notes to Consolidated Financial Statements contained in this Annual Report on Form 10-K.

The following table sets forth information with respect to our consolidated statements of income for the years ended December 31, 2007 and 2006.

Certain per share data and percentage amounts may not total due to rounding.

Revenue.  Revenue increased 6.0% for the year ended December 31, 2007, as compared to the same period in 2006, due primarily to $14.7 million of increases related to the radio ratings subscriber base, contract renewals, and price escalations in multiyear customer contracts for our quantitative data license revenue, a $3.4 million increase in Scarborough revenue resulting primarily from new business contracts, and a $2.1 million increase in PPM International revenues, partially offset by decreased national marketing pilot panel revenues, which due to the formation of Project Apollo LLC in February 2007, are now being recorded directly by the affiliate. Effective with the formation of Project Apollo LLC, we now record our share of Project Apollo’s net operating results through the equity in net income of affiliates line of our consolidated income statement.

Cost of Revenue.  Cost of revenue increased by 30.2% for the year ended December 31, 2007, as compared to the same period in 2006. Cost of revenue increased as a percentage of revenue to 46.4% in 2007 from 37.8% in 2006. The increase in cost of revenue was largely attributable to an increase in our quantitative, qualitative and software application services of $41.8 million, which was comprised substantially of a $21.1 million increase in PPM service rollout costs largely associated with the management and recruitment of the PPM panels for the Philadelphia, New York, Los Angeles, and Chicago markets; a $9.7 million increase in expenses associated with PPM ratings costs that were classified as research and development in 2006 and as cost of revenue in 2007; a $1.7 million increase in diary data collection and processing costs; and a $3.1 million increase associated with response rate initiatives; a $2.2 million increase in royalties, substantially associated with our Scarborough affiliate; a $2.0 million increase due to operating costs associated with the opening of a third participant interviewing center during the first quarter of 2007; and a $1.7 million increase associated with computer center costs. Additionally, PPM International cost of revenues increased by $1.1 million for the year ended December 31, 2007, as compared to the same period in 2006. These increases were partially offset by a $6.5 million decrease in national marketing research service costs, which due to the formation of Project Apollo, are now being expensed directly by the affiliate. We record our share of Project Apollo’s net operating results through the equity in net income of affiliates line of our consolidated income statement. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Subsequent Event — Project Apollo” for a description of the decision to terminate Project Apollo. We expect that our cost of revenue will continue to increase as a result of our efforts to commercialize the PPM ratings service and support the rollout of this service over the next two to three years.

Selling, General and Administrative.  Selling, general and administrative expenses increased by 1.3% for the year ended December 31, 2007, as compared to the same period in 2006. The increase in selling, general and administrative expenses was due primarily to a $1.2 million increase in expenses and amortization related to our accounts receivable and contract management system that was implemented during the second quarter of 2006, a $0.9 million increase in marketing communication costs, and a $0.8 million increase in expenses for merger and acquisition advisory services incurred during the year ended December 31, 2007, as compared to the same period in 2006. These increases were partially offset by a $2.2 million decrease associated with lower employee incentive plan expenses.

Research and Development.  Research and development expenses decreased 3.8% during the year ended December 31, 2007, as compared to the same period in 2006. The decrease in research and development expenses resulted primarily from a $9.7 million decrease in expenses associated with PPM ratings costs that were classified as research and development in 2006 and as cost of revenue in 2007, partially offset by a $3.9 million increase in expenses associated with our continued development of the next generation of our client software, a $2.9 million increase related to applications and infrastructure to support the PPM service, and a $1.2 million increase in expenses to support our diary rating service.

Equity in Net Income of Affiliates.  Equity in net income of affiliates (relating collectively to Scarborough and Project Apollo) decreased by 47.6% for the year ended December 31, 2007, as compared to the same period in 2006, due primarily to the formation of Project Apollo in February 2007. Our share of the Project Apollo affiliate loss was $4.3 million and our share of Scarborough’s income increased by $0.6 million for 2007, as compared to 2006. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Subsequent Event — Project Apollo” for a description of the decision to terminate Project Apollo.

Interest Income.  Interest income decreased 29.6% during the year ended December 31, 2007, as compared to the same period in 2006 due to lower average cash and short-term investment balances, which were partially offset by higher interest rates.

Interest Expense.  Interest expense decreased 89.1% for the year ended December 31, 2007, as compared to the same period in 2006, due to our prepayment of our senior-secured notes obligation on October 18, 2006. In accordance with the provisions of the note agreement, we were obligated to pay an additional make-whole interest amount of $2.6 million as a result of the prepayment. Borrowings under our new 2006 revolving credit facility did not commence until the fourth quarter of 2007. As a result, outstanding borrowings on average and the related interest expense were significantly lower during the year ended December 31, 2007, as compared to the same period in 2006.

Income from Continuing Operations.  Income from continuing operations decreased 19.5% for the year ended December 31, 2007, from the same period in 2006, due primarily to planned expenses required to build our PPM rollout panels for the Philadelphia, New York, Chicago, and Los Angeles markets, and to support the strategic development of our PPM ratings business. Incremental expenses incurred in support of our diary ratings service and our Project Apollo national marketing research service also contributed to the decrease in income from continuing operations, partially offset by a decrease in interest expense associated with our prepayment of our senior-secured notes obligation in 2006. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Subsequent Event — Project Apollo” for a description of the decision to terminate Project Apollo.

EBIT and EBITDA.  We have presented EBIT and EBITDA, both non-GAAP financial measures, as supplemental information that we believe is useful to investors to evaluate our results because they exclude certain items that are not directly related to our core operating performance. EBIT is calculated by deducting interest income and adding back interest expense and income tax expense to income from continuing operations. EBITDA is calculated by deducting interest income and adding back interest expense, income tax expense, and depreciation and amortization to income from continuing operations. EBIT and EBITDA should not be considered substitutes either for income from continuing operations as indicators of our operating performance, or for cash flow, as measures of our liquidity. In addition, because EBIT and EBITDA may not be calculated identically by all companies, the presentation here may not be comparable to other similarly titled measures of other companies. EBIT decreased 24.3% and EBITDA decreased 18.5% for the year ended December 31, 2007, as compared to the same period in 2006, due primarily to planned expenses required to build our PPM rollout panels for the

The following table sets forth information with respect to our consolidated statements of income for the years ended December 31, 2006 and 2005.

Certain per share data and percentage amounts may not total due to rounding.

Revenue.  Revenue increased 6.3% for the year ended December 31, 2006, as compared to the same period in 2005, due primarily to increases in the ratings subscriber base, contract renewals, and price escalations in multiyear customer contracts for our quantitative data license revenue, a $2.9 million increase in Scarborough revenue resulting primarily from new business contracts, a $1.6 million increase in PPM International revenues, and a $1.1 million increase associated with the Project Apollo pilot panel for the national marketing research service which was initiated in 2006.

Cost of Revenue.  Cost of revenue increased by 18.6% for the year ended December 31, 2006, as compared to the same period in 2005, and as a percentage of revenue to 37.8% in 2006 from 33.9% in 2005. The increase in cost of revenue was largely attributable to a $10.3 million increase in our quantitative, qualitative and software application services, which primarily includes a $3.5 million increase in data collection and processing costs, a $2.9 million increase in costs associated with response rate initiatives and proportionality, a $2.3 million increase in Scarborough royalties resulting from the higher revenues mentioned previously, and a $0.6 million increase for additional compensation expense related to our share-based awards. Cost of revenue increased by $6.7 million related to the Project Apollo pilot panel for the national marketing research service. Similar expenditures were classified as research and development in the amount of $3.1 million for the year ended December 31, 2005. A $1.8 million increase related to increased PPM International business also contributed to the overall increase in cost of revenue for the year ended December 31, 2006 as compared to the same period in 2005.

Selling, General and Administrative.  Selling, general and administrative expenses increased 18.0% for the year ended December 31, 2006, as compared to the same period in 2005, and increased as a percentage of revenue to 24.6% in 2006 from 22.1% in 2005. Approximately $6.9 million of the increase in selling, general and administrative expenses was due to an increase in our quantitative, qualitative and software application services, which includes a $1.9 million increase in expenses associated with the update of our legacy financial and customer relationship management systems and increased sales and marketing costs of $2.3 million related to our ratings business, including the PPM service. The adoption of SFAS No. 123R, effective January 1, 2006, resulted in $5.2 million of additional compensation expense related to our share-based awards. Asset impairment charges related to internally developed software associated with the Nielsen election not to join us in the commercial deployment of the PPM service accounted for $0.6 million of the increase in selling, general, and administrative expenses.

Research and Development.  Research and development expenses increased 15.0% during the year ended December 31, 2006, as compared to the same period in 2005, and increased as a percentage of revenue to 13.8% in 2006 from 12.8% in 2005. Increased research and development expenses of $5.7 million resulted from continued development of the next generation of our client software, and applications and infrastructure to support the PPM service and the diary-based service ($5.5 million), and an increase in precommercialization panel expenses primarily in the Houston and Philadelphia markets ($2.9 million). These increases were partially offset by a $3.1 million decrease in research and development expenses associated with the Project Apollo pilot panel for a national marketing research service, which were classified as cost of revenue in 2006.

Equity in Net Income of Affiliate.  Equity in net income of affiliate (relating to our Scarborough joint venture) decreased 1.0% for the year ended December 31, 2006, as compared to the same period in 2005. The decrease in operating income for the affiliate resulted primarily from quality improvement initiatives initiated in 2006.

Interest Income.  Interest income was relatively flat for the year ended December 31, 2006 as compared to the same period in 2005, as lower average cash and short term investment balances were offset by higher interest rates.

Interest Expense.  Interest expense increased 52.6% for the year ended December 31, 2006, as compared to the same period in 2005, due to our prepayment of its senior-secured notes obligation on October 18, 2006. In accordance with the provisions of the note agreement, we were obligated to pay an additional make-whole interest amount of $2.6 million as a result of the prepayment. As a result of the prepayment, we also accelerated the amortization of the $0.3 million outstanding balance of deferred financing costs associated with the debenture. Both of these amounts were expensed as interest in our financial statements during the fourth quarter of 2006.

Income from Continuing Operations.  Income from continuing operations decreased 25.2% for the year ended December 31, 2006, as compared to the same period in 2005, due primarily to planned expenses required to build our PPM panels for markets other than Houston and to operate the Houston panel, additional share-based compensation expense associated with the adoption of SFAS No. 123R, effective January 1, 2006, and the strategic development of our ratings business and Project Apollo pilot panel.

EBIT and EBITDA.  We have presented EBIT and EBITDA, both non-GAAP financial measures, as supplemental information that we believe is useful to investors to evaluate our results because they exclude certain items that are not directly related to our core operating performance. EBIT is calculated by adding back net interest expense and income tax expense to income from continuing operations. EBITDA is calculated by adding back net interest expense, income tax expense, and depreciation and amortization to income from continuing operations. EBIT and EBITDA should not be considered substitutes for either income from continuing operations, or for cash flow, as indicators of our operating performance, or for cash flow, as measures of our liquidity. In addition, because EBIT and EBITDA may not be calculated identically by all companies, the presentation here may not be comparable to other similarly titled measures of other companies. EBIT decreased 17.5% and EBITDA decreased 13.2% for the year ended December 31, 2006, as compared to the same period in 2005.

Working capital was ($45.8) million and ($4.6) million as of December 31, 2007, and 2006, respectively. Excluding the deferred revenue liability, which does not require a significant additional cash outlay, working capital was $20.9 million and $62.0 million as of December 31, 2007, and 2006, respectively. Cash and cash equivalents were $21.1 million and $31.0 million as of December 31, 2007, and 2006, respectively. There were no short-term investments as of December 31, 2007. Short-term investments was $27.6 million as of December 31, 2006. We expect that our cash position as of December 31, 2007, cash flow generated from operations, and our available revolving credit facility will be sufficient to support our operations for the foreseeable future.

Net cash provided by operating activities was $65.1 million and $68.1 million for the years ended December 31, 2007, and 2006, respectively. The $3.0 million decrease in net cash provided by operating activities was mainly attributable to a $9.8 million decrease in income from continuing operations, which resulted primarily

Net cash used by investing activities was $0.7 million for the year ended December 31, 2007 and net cash provided by investing activities was $35.4 million for the year ended December 31, 2007. The approximately $36.0 million decrease was attributable to a $27.3 million decrease in net sales of variable-rate demand notes issued by municipal government agencies and auction-rate securities for the year ended December 31, 2007, as compared to the same period in 2006. No auction-rate securities were held at December 31, 2007. The repurchases of shares in 2006 and 2007 of $170.0 million in aggregate, and the repayment of the $50.0 million of senior secured note obligation in 2006 resulted in reduced available cash to invest in short-term investments during the year ended December 31, 2007, as compared to the same period in 2006. Increased capital spending of $5.6 million, related primarily to purchases of computer equipment and leasehold improvements for the year ended December 31, 2007, as compared to the same period in 2006, and a $2.9 million investment in the Project Apollo affiliate paid during the year ended December 31, 2007, also contributed to the decrease in net cash flow attributable to investing activities.

Net cash used in financing activities was $76.0 million and $111.1 million for the year ended December 31, 2007 and 2006, respectively. The $35.1 million fluctuation was driven primarily by our $50.0 million debt repayment made during the quarter ended December 31, 2006, of our then-outstanding senior secured note obligation as compared with $12.0 million of net borrowings in the year ended December 31, 2007, under our revolving credit facility. Additionally, a $1.8 million increase in proceeds was received from stock option exercises for the year ended December 31, 2007, as compared to the same period in 2006, which was the result of higher average stock prices during the first six months of the year ended December 31, 2007. These increases in cash flow were partially offset by the $30.0 million increase in stock repurchases.

On December 20, 2006, we entered into an agreement with a consortium of lenders to provide us up to $150.0 million of financing through a five-year, unsecured revolving credit facility (the “Credit Facility”). The agreement contains an expansion feature that allows us to increase the financing available under the Credit Facility up to $200.0 million. Interest on borrowings under the Credit Facility will be calculated based on a floating rate, which we can select for a duration of up to six months.

Our Credit Facility contains financial terms, covenants and operating restrictions that potentially restrict our financial flexibility. Under the terms of the Credit Facility, we are required to maintain certain leverage and coverage ratios and meet other financial conditions. The agreement contains certain financial covenants and limits, among other things, our ability to sell certain assets, incur additional indebtedness, and grant or incur liens on our assets. Under the terms of the Credit Facility, all of our material domestic subsidiaries, if any, guarantee the commitment. Currently, we do not have any material domestic subsidiaries as defined under the terms of the Credit Facility agreement. Although we do not believe that the terms of the Credit Facility currently limit the operation of our business in any material respect, the terms may restrict or prohibit our ability to raise additional debt capital when needed or could prevent us from investing in other growth initiatives. As of February 15, 2008, we do not have any outstanding debt under the Credit Facility. We have been in compliance with the terms of the Credit Facility since its inception.

On November 16, 2006, our Board of Directors (the “Board”) authorized a program to repurchase up to $100.0 million of our outstanding common stock through either periodic open-market or private transactions at then-prevailing market prices for up to two years. As of October 19, 2007, the program was completed with 2,093,500 shares being repurchased for an aggregate purchase price of approximately $100.0 million.

On November 15, 2007, our Board authorized a program to repurchase up to $200.0 million of our outstanding common stock through either periodic open-market or private transactions at then-prevailing market prices through November 14, 2009. As of February 15, 2008, no shares have been repurchased under this program.

The Board has continued to approve the payment of quarterly dividends of $.10 per common share to the stockholders of record as of the close of business on the 15th of each quarter-end month. For 2007 and 2006, a quarterly dividend payment was made in the month following each quarter-end.

Commercialization of our PPM radio ratings service requires and will continue to require a substantial financial investment. We believe we currently have sufficient cash as well as access to our existing credit facility to fund such requirements. We currently estimate that the annual capital expenditures associated with the PPM ratings service commercialization for audience ratings measurement will be approximately $20.0 million. We also anticipate that, over the first two to three years of commercialization, our results of operations will be materially negatively impacted as a result of the rollout of our PPM ratings service. The amount of capital required for deployment of our PPM ratings service and the impact on our results of operations will be greatly affected by the speed of the rollout schedule. While commercialization of the PPM ratings service will have a near-term negative impact on the Company’s results of operations, which impact likely will be material, restoration of our operating margins following the completion of the PPM transition process in the top 50 U.S. radio markets remains our goal, although there can be no assurance that this will be the case.

See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Subsequent Event — Project Apollo” for a description of the decision to terminate Project Apollo.

Working capital was ($4.6) million and $58.8 million as of December 31, 2006, and 2005, respectively. The $63.3 million decrease in working capital was primarily due to Arbitron using $50.0 million of available cash and short-term investments to prepay its senior-secured notes obligation on October 18, 2006. Excluding the deferred revenue liability, which does not require a significant additional cash outlay by Arbitron, working capital was $62.3 million and $121.2 million as of December 31, 2006 and 2005, respectively. Cash and cash equivalents were $33.6 million and $40.8 million as of December 31, 2006 and 2005, respectively. In addition, short-term investments and receivables from brokers, collectively, were $27.6 million and $82.6 million as of December 31, 2006 and 2005, respectively.

Net cash provided by operating activities was $68.1 million and $77.4 million for the years ended December 31, 2006, and 2005, respectively. The $9.2 million decrease in net cash provided by operating activities was mainly attributable to a $16.9 million decrease in income from continuing operations, which resulted primarily from planned costs required to build PPM panels for markets other than Houston, operate the Houston panel and develop the national marketing research service, and a $6.0 million decrease related to the excess tax benefit from stock option exercises for the year ended December 31, 2005. The decrease related to excess tax benefit from stock option exercises continue to be presented as an operating activity for 2005 in accordance with the modified prospective adoption of SFAS No. 123R on January 1, 2006. These decreases were partially offset by a $6.1 million increase in non-cash share-based compensation also due to the SFAS No. 123R adoption and a $2.6 million increase in deferred taxes.

Net cash provided by operating activities was further impacted by a $5.0 million increase related to accrued expenses and other current liabilities substantially due to a $4.7 million reversal of certain tax contingencies and other items in 2005, partially offset by a $3.3 million decrease in cash flow for increased purchases of PPM International inventory in 2006.

Net cash provided by investing activities was $35.4 million for the year ended December 31, 2006, and net cash used in investing activities was $102.4 million for the year ended December 31, 2005. The $137.7 million increase in cash provided by investing activities was driven primarily by the full year impact of increased net sales of short-term investments of $137.5 million. Our investment in available-for-sale variable rate demand notes issued by municipal government agencies and auction-rate securities began in the fourth quarter ended December 31, 2005. In addition, we acquired Integrated Radio Systems, L.L.C. on September 20, 2005 for $4.2 million. However, no acquisitions were made during the year ended December 31, 2006. These increases in cash flow from investing activities for the year ended December 31, 2006, as compared to the same period of 2005 were partially offset by increased capital spending of $4.1 million, which was largely related to PPM metering equipment purchases during 2006 for the PPM ratings service.

Net cash used in financing activities was $111.1 million and $20.8 million for the year ended December 31, 2006, and 2005, respectively. The $90.3 million fluctuation in financing activities was primarily attributable to the $50.0 million debt prepayment of our senior secured note on October 18, 2006 and a $30.0 million increase in repurchases of our outstanding common stock during the year ended December 31, 2006, as compared to the same period in 2005. The $9.0 million decrease in proceeds from stock option exercises was the result of significantly fewer options nearing expiration and lower average stock prices for the year ended December 31, 2006, as compared to the same period of 2005. Our first quarterly dividend payment to stockholders was paid in April 2005. A $2.7 million increase in dividend payments resulted for the year ended December 31, 2006, as compared to the same period of 2005 because four quarterly dividend payments to stockholders were made during 2006, as compared to the three payments made during the same period of 2005.

The following table summarizes our contractual cash obligations as of December 31, 2007 (in thousands):