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We usually recommend recruiting 6-8 participants from each unique user group. This sample size will reveal most of your product's usability flaws without overlearning, slowing down the process or breaking your budget. Most of our clients have two or three user groups, which equates to about 12-24 sessions, or two or three days of testing. To find the right sample size for your study, consider the types of people who use your product to do different things. For example, doctors and patients would probably use a hospital's web site differently, so you'd want feedback on their unique tasks and perspectives. Other common user types include experienced users versus new users, supervisors versus line staff, or customers versus employees. |
