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HEART metric

What is the HEART metric?

Work methodology developed by Google to measure user experience in digital products, which includes five categories with indicators (Happiness, Engagement, Adoption, Retention, Task success: HEART). Happiness (happiness) measures the user's attitude towards the system, engagement evaluates the level of involvement of the user with the product, adoption (adoption) is the number of new users of a product or a product characteristic, retention (retention) it is the rate at which users return to using a product and task success (tasks) includes traditional metrics of behavior in user experience.