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Cecil E Greek

Abstract

A paper presented on the question of how many subjects are required for statistically valid usability research. This paper argues that the conventional wisdom that a similar number is appropriate for all studies is not valid, and instead proposes a mechanism for matching the sample size with the issue being tested.

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References

Denning, S., Hoiem, D., Simpson, M., and Sullivan, K. 1990, The value of thinking-aloud protocols in industry: A case study at Microsoft. The Human Factors Society, Santa Monica, CA, Human Factors Society.

Dosher, B. A. 1981, The effects of delay and interference: A speed-accuracy study, Cognitive Psychology 13, 541-574.

Hintzman, D. L., and Caulton, D. A. 1997, Recognition memory and modality judgments: A comparison of retrieval dynamics, Journal of Memory and Language 37, 1-23.

Lewis, J. R. 1994, Sample sizes for usability studies: Additional considerations, Human Factors, 36, 368-378.

Nielsen, J., and Landauer, T. K. 1993, A mathematical model of the finding of usability problems, Proceedings of the ACM InterCHI '93 Conference (ACM, Amsterdam, the Netherlands)

Nielsen, J. 1993, Usability Engineering. (AP Professional, Boston).

Reed, A. V. 1973, Speed-accuracy tradeoff in recognition memory, Science, 181, 574-576.

Virzi, R. A. 1992, Refining the test phase of usability evaluation: How many subjects is enough?, Human Factors, 34, 457-468.

Wickelgren, W. A. 1977, Speed-accuracy tradeoff and information processing dynamics, Acta Psychologica 41, 67-85.

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