Formal User Studies
Outline
Formal Usability Studies
Experiment Design
Interactions among Attributes
Between Groups vs. Within Groups
Special Considerations for Formal Studies with Human Participants
More Special Considerations
Experiment Design Example: Marking Menus
Why Marking Menus?
What do we want to know?
Experiment Factors
Experiment Hypotheses
Experiment Overall Results
A Learning Effect
Factoring to Expose Interactions
Average response time and errors as a function of device, menu size, and menu type
Statistical Tests
Analyzing the Numbers
Analyzing the Numbers (cont.)
Followup Work
Summary
References
Email: hearst@sims.berkeley.edu
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