Agencies need to be concerned about the unprecedented number of reviews planned for the upcoming months. (Much of the last two years were also extreme.) A recent AdAge article pointed to a survey conducted by Advertiser Perception that revealed approximately two-thirds of advertisers plan to review their agencies in the next year. And that includes virtually all types of agencies. The study covered 420 marketers in 118 companies which represent about 90% of the top 100 U.S. advertisers.