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Strategy & Metrics
Behavioral Metrics: Task Success & Time-on-Task — Quiz
5 questions
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Question 1 of 5
Behavioral Metrics: Task Success & Time-on-Task
You are running a quantitative usability benchmark to measure task success rate with a 95% confidence interval of ±10 percentage points. What is the minimum number of participants you need?
5 users — the standard usability testing rule
12–15 users — enough for statistical patterns to emerge
40–60 users — required for that confidence level and margin of error
100+ users — behavioral benchmarks always require large samples
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