A set of recommendations established by the The
Interactive Advertising
Bureau (IAB) that assist companies that report audience
metrics to achieve transparency in audience
counts and to revise out-of-date methodologies. The Audience Measurement
Guidelines provide details on measurement of Audience Reach related to
Internet-based content or advertising and are used
by Internet Publishers, Ad-serving organizations, Syndicated Measurement
Organizations and auditors.
See "Audience Reach
Measurement Guidelines" on the IAB Web site.