Much research has shown that there are severely diminishing returns from usability testing any given design. The first few users find almost all the major usability problems, and you learn less from each subsequent study participant. The details of the mathematics behind this fact, including assumptions about users, tasks, and what constitutes a “problem,” are given in a research paper from Bell Communications Research
- Planning Your Recruiting Needs
- from 233 Tips and Tricks for Recruiting Users as Participants in Usability Studies
- Publisher: New Riders
- Released: February 2010
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