- Experts generally agree that using 5-15 participants per qualitative user test iteration will uncover 80% of usability issues, and is the most efficient manner to conduct agile user experience testing. We have found that it is more efficient and cost-effective to conduct numerous small sample studies iteratively, and then use multivariate testing at the end of the process with larger samples to conduct final optimization. Please refer to the following reference materials:
- March 2000: Why You Only Need to Test with 5 Users
- March 2003: What’s in a Number?
- September 2006: How Many Usability Test Participants do you Need?
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