HEART is a user-centered metrics framework developed by Google. ## Components - **Happiness:** User satisfaction and attitude - **Engagement:** Level of user involvement - **Adoption:** New user acquisition - **Retention:** Existing user retention - **Task Success:** User efficiency and effectiveness ## Usage Used for measuring and improving user experience metrics. Provides a comprehensive framework for tracking product success from the user's perspective. ## Examples and Applications - **Feature Success:** Measure impact across all five dimensions - **UX Improvement:** Track satisfaction and task success rates - **Product Strategy:** Balance growth (adoption) with quality (happiness) - See also: [[GAME]], [[AARM]], [[CIRCLES]]