“I believe the success of a test is at least 50% dependent on how you plan it how you strategize it how you hypothesize it and how you execute it and execution is just the what part maybe it's even sometimes less than 50%”

Planning and hypothesizing drive at least 50% of a test's success

Most teams over-index on execution and under-invest in test design. Alper argues the structure of your hypothesis — what you are testing, why, and what outcome changes behavior — matters as much as the creative or spend itself. Skipping this makes results uninterpretable and iteration impossible.