The ‘magic number 5’
Is it enough for web-testing?
Common practice holds that 80% of usability findings are discovered after five participants. Recent findings from web testing indicate that a much larger number of participants is required to get results and that independent teams testing the same web-based product do replicate results. Other findings suggest that results improve when testing teams work closely with developers in planning the test. This paper presents an insider view of the CUE-2 evaluation that may stimulate further debate regarding the results, plus two cases in which different teams uncovered the same usability issues, working independently but closely with the sponsor.
Keywords: usability testing, web usability, number of users, reliability
Published online: 02 April 2004
Cited by 10 other publications
Alhadreti, Obead & Pam Mayhew
Baskoro, Kezia & Ari Widyanti
Clarke, Martina A, Jeffery L Belden & Min Soon Kim
Clarke, Martina A., Jeffery L. Belden & Min Soon Kim
M.S. Kim, Shapiro, J.S., Genes, N., Aguilar, M.V., Mohrer, D., Baumlin, K. & Belden, J.L.
Kools, Marieke, Robert A. C. Ruiter, Margaretha W. J. Wiel & Gerjo Kok
Melton, Brittany, Zillich, Alan, Saleem, Jason, Russ, Alissa, Tisdale, James & Brian Overholser
This list is based on CrossRef data as of 28 august 2021. Please note that it may not be complete. Sources presented here have been supplied by the respective publishers. Any errors therein should be reported to them.