Recall the minimum checks for a trustworthy A/B test or holdout.
mixed-card-deck battlecard compare-card Can we just ship to half the users and see what happens? The team wants speed more than design. Your line Yes, if we define the randomization unit, primary metric, guardrails, and stopping rule first. Otherwise half the users only gives us half a valid answer. Treating exposure split as the whole experiment design. It agrees to testing while naming the minimum design checks. Primary metric versus guardrail metric Compare A test can win the primary metric and still fail if a guardrail is damaged. Why name the randomization unit? Because users, sessions, accounts, and teams can…
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