# How Do You Run a Controlled Test of AI Video Hooks for One Product? > Test AI video hooks by changing only the opening idea, randomizing delivery to the same audience, keeping the body and offer fixed, and selecting winners with predeclared metrics and minimum sample rules rather than early click-through fluctuations. file:///tmp/atlas-body5-20261013/zh.txt ## FAQ ### What counts as a video hook? The hook is the opening visual, spoken line, text, sound, or action intended to earn attention and set up the product promise. ### How many hooks should one test include? Start with four to eight meaningfully different hypotheses. Too many minor variations divide the sample without teaching you much. ### What should remain constant across variants? Keep the product, audience, placement, offer, body sequence, call to action, landing page, duration, and delivery settings as consistent as possible. ### Which metric should choose the winner? Use a primary metric tied to the hook's job, such as qualified hold rate, while treating clicks, conversion, and cost as downstream guardrails. ### When should a test stop? Stop at a predeclared duration and minimum sample, or at a valid sequential-testing boundary, not simply when one variant is temporarily ahead. ### Can the winning hook be used for every audience? No. A winner is conditional on the tested audience, placement, offer, and time period, so confirm it in a follow-up test before broad rollout.