Certification that advertising service has been delivered per contract.

Some advertisers may want proof that the ads they've bought have actually run and that clickthrough figures are accurate. In print media, tearsheets taken from a publication prove that an ad was run. On the Web, there is no industry-wide practice for proof of performance. Some buyers rely on the integrity of the media broker and the Web site. The ad buyer usually checks the Web site to determine the ads are actually running. Most buyers require weekly figures during a campaign. A few want to look directly at the figures, viewing the ad server or Web site reporting tool.

Certification that outdoor media services have been executes per contract.