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# Co-Viewing Measurement
- URL: https://www.adlingo.org/glossary/co-viewing-measurement/
- Published: 2025-01-15T11:32:00.000Z
- Updated: 2025-01-15T11:32:00.000Z
- Description: Methods for estimating the number of people watching content simultaneously on the same device, particularly in living room environments.
- Author: Travis Lusk
- Tags: CTV, #glossary, #Import 2026-10-27 17:05

Estimating how many people are actually in the room when your ad plays. A household with four viewers is not the same as a household with one. CTV impression counts don't distinguish between them. Co-viewing models try to account for this gap using panel data and device signals. The estimates are imperfect, but they're still better than assuming one device equals one person.