Service Comparison     Media Metrix Nielsen/ NetRatings Interwatch AdRelevance Methodology           Time Lag (weeks) 6 2 6 1   Proprietary Technology Tracking Meter & 28K Panel Tracking Meter & 15K Panel Web Crawler & Clippers Intelligent Agent   Monthly Traffic Data (Page Requests) 12.3MM 4.8MM Reported by Sites 44.8MM   Monthly Collection (Unique Ads) N/A 900 N/A 12,000             Ad Metrics           Impressions -   Spending - -   Unique Ads - - -             Granularity           Property - -   Genre   Site   Subsite - -             Ads By           Industry - -   Company -   Class - -   Product - - -             Report Flexibility           Search   Custom Query - - -   Charts & Graphs - - -   Downloads   Clickable Ad Portfolio - -   Personal Workspace - - - Media Metrix World Wide Web Audience Ratings Trend Report, March 1999 Nielsen/NetRatings Audience Summary Information - Average Usage, May 1999 Nielsen/NetRatings BannerTrack (TM) - Banner Impressions, April 1999

A breakdown of the AdRelevance Service as it compares to other leading media tracking companies.