A mathematical model of the finding of usability problems Export

@inproceedings{citeulike:1349894, abstract = {For 11 studies, we find that the detection of usability problems as a function of number of users tested or heuristic evaluators employed is well modeled as a Poisson process. The model can be used to plan the amount of evaluation required to achieve desired levels of thoroughness or benefits. Results of early tests can provide estimates of the number of problems left to be found and the number of additional evaluations needed to find a given fraction. With quantitative evaluation costs and detection values, the model can estimate the numbers of evaluations at which optimal cost/benefit ratios are obtained and at which marginal utility vanishes. For a \“medium\” example, we estimate that 16 evaluations would be worth their cost, with maximum benefit/cost ratio at four.}, address = {New York, NY, USA}, author = {Nielsen, Jakob and Landauer, Thomas K.}, booktitle = {CHI '93: Proceedings of the INTERACT '93 and CHI '93 conference on Human factors in computing systems}, citeulike-article-id = {1349894}, citeulike-linkout-0 = {http://portal.acm.org/citation.cfm?id=169166}, citeulike-linkout-1 = {http://dx.doi.org/10.1145/169059.169166}, doi = {10.1145/169059.169166}, isbn = {0-89791-575-5}, keywords = {evaluation, hci, usability}, location = {Amsterdam, The Netherlands}, pages = {206--213}, posted-at = {2009-06-28 20:07:21}, priority = {0}, publisher = {ACM}, title = {A mathematical model of the finding of usability problems}, url = {http://dx.doi.org/10.1145/169059.169166}, year = {1993} }

TY - CONF ID - citeulike:1349894 L3 - citeulike-article-id:1349894 N2 - For 11 studies, we find that the detection of usability problems as a function of number of users tested or heuristic evaluators employed is well modeled as a Poisson process. The model can be used to plan the amount of evaluation required to achieve desired levels of thoroughness or benefits. Results of early tests can provide estimates of the number of problems left to be found and the number of additional evaluations needed to find a given fraction. With quantitative evaluation costs and detection values, the model can estimate the numbers of evaluations at which optimal cost/benefit ratios are obtained and at which marginal utility vanishes. For a “medium” example, we estimate that 16 evaluations would be worth their cost, with maximum benefit/cost ratio at four. CY - Amsterdam, The Netherlands SN - 0-89791-575-5 AD - New York, NY, USA EP - 213 TI - A mathematical model of the finding of usability problems PB - ACM T2 - CHI '93: Proceedings of the INTERACT '93 and CHI '93 conference on Human factors in computing systems SP - 206 KW - evaluation KW - hci KW - usability AU - Nielsen, Jakob AU - Landauer, Thomas PY - 1993/// UR - http://dx.doi.org/10.1145/169059.169166 ER -