One year after the Out-of-Home Video Advertising Bureau (OVAB) released its Audience Metrics Guidelines for measuring digital out-of-home (DOOH) advertising media, the association will again convene at the end of this month in New York City to discuss how it the guidelines are performing in the marketplace. But this time, the focus will be on real-world DOOH advertisers and the impact the medium has had on their recent ad campaigns, rather than on theories of measurement.