A designer, researcher, and user conduct discrete usability sessions together. Between sessions, designers incorporate feedback from previous sessions.
Provides fast feedback on discrete features and workflows
Answers questions about targeted areas in the interface
Compares two versions of the same interface for the same task and determines which is easier/more desirable. Requires significant number of participants to be valid.
Provides data on the relative performance of two different designs that vary in small, quantifiable ways.
Answers questions about specific areas of the interface