Summary: To learn something useful from a usability study, you must have the test participants perform tasks that are representative of typical user goals, while avoiding bias caused by giving too detailed directions or hints.
Related Article
Writing Tasks for Quantitative and Qualitative Usability Studies
All usability studies involve asking participants to perform tasks, but the correct way to write those tasks depends on the methodology you’re using. Good quantitative tasks are concrete and focused, while good qualitative tasks are open-ended, flexible, and exploratory.
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