In late 2023 the IAB Tech Lab published its Attention Measurement Guidelines, the first formal industry framework for measuring whether a person actually paid attention to an ad. The guidelines arrived a decade after the Media Rating Council viewability standard had set the floor at fifty percent of pixels for one second for display, two for video. Viewability solved a real problem in 2014. It is not solving the right problem in 2026.
Why viewability stopped working
The metric checks a pixel boundary. It does not check whether the user noticed. Inventory has gotten denser, screens have gotten taller and users have gotten faster at scrolling. A unit can be technically viewable for the required two seconds while the user has already mentally moved past it.
The consequence is unfriendly. Viewability rates have crept up across the open web while the engagement they were proxying has crept down. Adelaide and Lumen Research have been publishing this divergence for years. Buyers paid more, advertisers got the same outcome, budgets quietly left the channel.
What attention metrics measure
The IAB's Tier-1 attention signal combines three inputs.
- Time in view weighted by user engagement: scroll velocity, dwell, interaction
- Eye-tracking estimates inferred from scroll patterns or, in pilots, on-device sensor data
- Cognitive-load proxies: creative format complexity, audio-on rates, completion rates
Vendors have been rationalising these into a single attention score normalised across formats. The maths is debatable. The direction is not.
What it changes operationally
The first thing that shifts is the bid. A unit that holds twice the attention of an industry-standard unit should clear at a higher CPM. A unit that holds a fraction of that should price lower. We have run this in dynamic creative tests on display and the units that earned attention also earned ROAS. The correlation is not subtle.
The second shift is the creative brief. If attention is the new floor, the creative needs to earn it within the first second. That is a different brief from 'build a beautiful unit'. It is closer to 'design the first frame as if it were the only frame'.
“Attention is the metric that finally aligns the buyer's incentive, the publisher's inventory, and the user's experience.”
What is still missing
Two things stop attention from becoming the universal metric. The first is comparability. A six-second mobile video and a static desktop unit produce different attention curves; making them apples-to-apples is non-trivial. The second is audit. Every vendor reports a slightly different score from slightly different data. Buyers want one number; today they get five.
These will resolve. The IAB working group is already rationalising the maths. In the meantime, attention should sit alongside viewability in every report, not replace it. But twelve months from now, replacing it will be the question every measurement team is being asked.