WHAT IT IS
Approaches range from survey-based copy tests (Nielsen, System1, Kantar LINK) to behavioral methods like eye-tracking, facial coding, and implicit response timing. Most modern protocols combine rational measures (message comprehension, purchase intent lift) with emotional measures (emotional intensity, brand feeling) because both independently predict in-market outcomes.
HOW IT WORKS
Ads are exposed to matched samples (test creative vs. control or benchmark), respondents complete validated outcome batteries, and scores are compared to a normative database of past campaigns in the same category. Strong tests capture unaided brand recall, message playback, and persuasion lift on the actual business metric the campaign targets.
WHEN TO USE
Run ad testing before flighting meaningful media weight, when creative is being reused across markets, or when selecting among multiple executions. Skip it when the cost of testing exceeds the cost of being wrong in market.