Usability Testing with 5 Users: ROI Criteria (video 2 of 3)

Summary: The number of test participants for qualitative usability testing that optimizes return-on-investment is determined by 2 parameters: the facilitator's observational skills and the design team's speed when generating the next design iteration.

https://www.youtube.com/watch?v=U23Bz5_eHII

Video Author

Jakob Nielsen, Ph.D., is a User Advocate and principal of the Nielsen Norman Group which he co-founded with Dr. Donald A. Norman (former VP of research at Apple Computer). Dr. Nielsen established the "discount usability engineering" movement for fast and cheap improvements of user interfaces and has invented several usability methods, including heuristic evaluation. He holds 79 United States patents, mainly on ways of making the Internet easier to use.

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