In-store retail media measurement according to IAB: ad plays, impressions, OTS, and store zones
Measuring in-store retail media requires shared definitions of the display medium, zone, playout, and audience. Without them, retailers, advertisers, and agencies may use the same terms for completely different metrics. IAB and IAB Europe standards bring structure to this space, making in-store campaigns easier to plan, compare, and account for.
What the shared baseline should be
The first layer consists of ad plays, representing verified ad playbacks. A report should identify the creative, screen, location, zone, timestamp, and duration of the playout. The second layer is gross impressions: the estimated number of contacts or opportunities for contact calculated using a transparent methodology. The methodology must specify the data source, measurement period, extrapolation method, and any limitations.
OTS, or opportunity to see, does not guarantee that the ad was seen. It describes the opportunity for exposure arising from the viewer's presence in the relevant zone at the right time. Therefore, attributing the total footfall of an entire store as impressions for a single screen without qualification is unacceptable.
The zone is part of the media product
An entrance screen, an on-shelf display, a menuboard, and a screen in the checkout area each have a distinct context, dwell time, and role in the shopper journey. Inventory should specify at least: format, orientation, size, zone, location type, operating hours, average footfall, available metrics, creative constraints, and technical status.
| Reporting layer | Minimum scope |
|---|---|
| Playout | ad plays, timestamp, screen, location, errors |
| Audience | estimation method, gross impressions, OTS, measurement period |
| Campaign | SOV, pacing, locations, formats, plan delivery |
| Context | zone, hour, footfall, product availability |
| Outcome | POS data, sales lift, test and control, study limitations |
How to avoid disputes over the numbers
Every report should include a KPI glossary and a methodology version. Raw data, estimates, and conclusions must remain clearly separated. If the audience is modelled on a sample, the weighting approach must be disclosed. If the source relies on camera or sensor data, coverage, accuracy, and data loss rates must be detailed. If a campaign combines screen and audio, both channels should feature independent playout logs linked by a common campaign ID.
Nedilo's perspective
Becoming Retail Media Ready starts with structured inventory and reporting, not with selling the first campaign. Nedilo delivers screen and zone taxonomies, Proof of Play, data exports, and connectors for ad servers and media partners.
Frequently asked questions
What is an ad play?
An ad play is a confirmed playback of a creative on a specific screen, at a given time and location. It is a delivery unit, not an audience metric.
How do gross impressions differ from footfall?
Footfall describes traffic within a venue or zone, whereas gross impressions represent the estimated number of contacts with a specific screen. Applying the entire store's footfall to a single screen inflates the result.
Does OTS mean an ad view?
No. OTS (opportunity to see) denotes the potential for contact based on the audience's presence in the zone during playout, without confirming that the ad was actually noticed.
How should screen inventory be documented?
Inventory should include format, orientation, size, zone, location type, operating hours, average footfall, available measurement data, creative specifications/limitations, and the technical status of the display.
Sources
About the author and methodology
This material was prepared by the Nedilo expert team based on digital signage and in-store audio deployments in retail, QSR, petrol and commercial venues across Europe, as well as public industry standards (including IAB Europe, EDPB guidance and Google Search documentation). We verify recommendations in multi-location projects and update them whenever standards change.
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