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This research aims to model the detection of usability problems based on user testing and heuristic evaluations.

January 1, 1993Open Access

A mathematical model of the finding of usability problems

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This research aims to model the detection of usability problems based on user testing and heuristic evaluations.
Analyzed 11 studies to model usability problem detection as a Poisson process.
Estimated evaluation costs and benefits for optimal testing strategies.
Provided a quantitative evaluation framework for planning usability assessments.
Estimated that 16 evaluations yield worthwhile cost, with a maximum benefit/cost ratio at four evaluations.
Demonstrated that early test results can predict remaining usability problems and required evaluations to detect them.
Established that utility diminishes after a certain number of evaluations.

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Randomized trial demonstrates estimation of usability problems in evaluations, indicating optimal testing strategies.

Nielsen et al. (1993) studied this question.

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