User Experience
Task Success Rate
Also known as: Success rate
Plain English
How many people actually complete the task.
Definition
Task glossarySuccess RateSuccess rate is the proportion of users who complete a given task successfully. It depends on defining what counts as success before testing begins, otherwise the threshold moves to fit the result.Open glossary term measures the percentage of users who successfully complete a given task.
In practice
Used in guideUsability TestingObserving users complete tasks to identify usability issues, friction, and barriers to success.Open guide to quantify how effective a design is.
In context
Defining what counts as success before the glossarySessionA session is a single period of user interaction with a product, from entry to exit within a defined timeframe.Open glossary term is what keeps it honest. Partial success needs its own category, decided in advance.
The reality
High glossarySuccess RateSuccess rate is the proportion of users who complete a given task successfully. It depends on defining what counts as success before testing begins, otherwise the threshold moves to fit the result.Open glossary term can still hide frustration or inefficiency.
Compared with
Task Success Rate vs Error Rate
glossarySuccess RateSuccess rate is the proportion of users who complete a given task successfully. It depends on defining what counts as success before testing begins, otherwise the threshold moves to fit the result.Open glossary term counts completions. glossaryError RateError rate measures how often users make mistakes while attempting a task. It is most useful when it separates minor slips users recover from and errors that block progress entirely, because the two need different fixes.Open glossary term counts mistakes made along the way. A task can be completed at a high rate and be riddled with errors that cost time and glossaryConfidenceConfidence is the level of certainty in a decision or outcome based on available evidence.Open glossary term.
FAQ
Common questions
A few practical answers to the questions that usually come up around this term.
What is task success rate?
It is the percentage of users who complete a task successfully.
Why is it important?
It shows how effective a design is.
What is a limitation?
It does not measure how easy or frustrating the task was.
How is it calculated?
Successful completions divided by total attempts.
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