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.
Jakob Nielsen, Ph.D., is a retired principal and co-founder (with Dr. Donald A. Norman) of the Nielsen Norman Group. Jakob established the "discount usability engineering" movement for fast and cheap improvements of user interfaces and invented the heuristic evaluation method.
