Google’s HEART Framework helps measure the quality of user experience. You can apply HEART to a specific feature or a whole product. The HEART framework can help you find UX metrics to relevant to that product. HEART stands for five broad categories.
1. Happiness – These metrics are often captured through surveys, and measure user attitudes for things like satisfaction and happiness.
2. Engagement – These metrics have monitored the level of user involvement such as number of visit per month, number of photos uploaded per user per day, number of shares. These type of metrics will really depend on the types of activities that the user will do.
3. Adoption – Through this metrics, you can track new users to the product or a specific feature such as New account created in a week, Upgrades to the latest version, New subscriptions created, Purchases made by new users
4. Retention – The rate at which existing users are returning.The number of active users remaining present over time, Renewal rate, Repeat purchases.
5. Task Success – These types of metrics related to the traditional behaviour metrics such as efficiency, tome to complete a task.
Courtesy- http://www.dtelepathy.com/ux-metrics, Udacity, google
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