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Sources & notes
Google’s HEART paper is a framework for choosing metrics, not a questionnaire. Fillo wrote these questions and follow-ups; there is no validated HEART score here.
After the product activity you want to assess. Decide which goal and observed behavior you will compare with the answers.
Compare satisfaction and reported task completion separately with observed behavior. Keep timing and recruitment consistent. Use SUS or UMUX-Lite if you need a standardized usability measure.