You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Viewable Impressions Are the Future of Metrics: Are You Ready? Publishers Will Need Ongoing Course Corrections to See What Works Best for Them and Their Advertisers By Peter Naylor, Published on September 27, 2012 12 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.