Lecture 5: Issues-based MetricsJanet WessonDepartment of Computing SciencesUsability Engineering (WEUV401)1
3Topics1.What is a usability issue?2.How can we identify usability issues?3.How can we assign severity ratings to issues?4.Will all evaluators find the same usability issues?5.How many participants are enough?6.How many tasks are enough?7.How can we fix usability issues?3
41. What is an usability issue?.
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52. Identifying usability issues•Very easy or very difficult?•Very obvious or very subtle?•Critical success factors:–Understanding what is (and isn’t) an issue (problem).–Knowing both the product and the usability questions thatarise.–Being very observant of participant behaviour.The most common way to identify UX issues is during a study in which youare interacting with a participant directly.A key point to consider is how UX issues will be addressed.The most common use is an iterative design process focused on improvingthe product.The most useful issues are those that point to possible improvements in theproduct.For example, “Many participants were confused by the top-level navigationmenu”.All recommendations to improve the overall UX should take into account thebusiness and technical constraints.Some UX issues arepositive– these are sometime called usability “findings”.The main reason for reporting positive findings is to make sure that theseaspects of the UI don’t get removed in future design iterations.5
63. How to identify issues•Methods:–Expert reviews/inspections.