Task success rate is one of the most widely used and easily understood UX metrics. It shows the percentage of participants that successfully complete a task and helps designers identify user experience issues. As long as tasks have clearly defined goals, success rates can be measured.
Tasks like completing a signup process or adding a specific item to a shopping cart are well-suited for this metric. Keep in mind, success rate doesn’t explain how well users perform tasks or why they fail them.
Read on for several additional measures and frameworks.