Proceedings of the Human Factors and Ergonomics Society 42nd Annual Meeting, Santa Monica, CA (1998), 1346-1350.
Inspection is a fundamental means of achieving software usability. Past research showed that during
usability inspection the success rate (percentage of problems detected) of each individual inspector was
rather low. We developed perspective-based usability inspection, which divides the large variety of usability
issues along different perspectives and focuses each inspection session on one perspective. We conducted a
controlled experiment to study its effectiveness, using a post-test only control group experimental design,
with 24 professionals as subjects. The control group used heuristic evaluation, which is the most popular
technique for usability inspection. The experimental results are that 1) for usability problems covered by
each perspective, the inspectors using that perspective had higher success rate than others; 2) for all
usability problems, perspective inspectors had higher average success rate than heuristic inspectors; 3) for
all usability problems, the union of three perspective inspectors (with one from each perspective) had
higher average success rate than the union of three heuristic inspectors.