When a User Interface is Good Enough: User Ratings in UI Design
Martin L. Fracker, Michal Heck, George Goeschel · Proceedings of the Human Factors and Ergonomics Society Annual Meeting · 2010
When is the usability of a new user interface design good enough to stop trying to improve it? To answer this question, we propose that usability ratings should be scaled in terms of specific usability criteria, and we evaluated this proposal in an iterative user interface design effort. We also tested our hypothesis that usability ratings arise from the interaction of three user interface dimensions: content, functionality, and layout. We found that scaling usability ratings in terms of specific requirements was effective in identifying when to stop iterating a design, and that ratings of the UI dimensions predicted the usability ratings.