Transcript Evaluation Through Expert Analysis U0422533 U0423507

Evaluation Through Expert
Analysis
U0422533
U0423507
U0526893
Cognitive Walkthrough
• Similar to a code walkthrough.
• Identify difficulty areas.
• Any stage in the design process.
• Relatively cheap.
What You Need
• System prototype
• Description of task
• Complete list of actions
• Knowledge of intended users
Four Questions
• Effect of action = user’s goal?
• Visibility of available actions
• User knowledge of actions
• Understandable feedback
Heuristic Evaluation
• Method of evaluating the system
• Method of finding usability problems
• Discount usability technique
• Needs 3 to 5 evaluators
10 Heuristics
• 1. Visibility of system status
• 2. Match between system and real world
• 3. User control and freedom
• 4. Consistency and standards
• 5. Error prevention
Cont…
• 6. Recognition rather than recall
• 7. Flexibility and efficiency of use
• 8. Aesthetic and minimalist design
• 9. Help users recover from errors
• 10. Help and documentation
Model-based evaluation
• A third expert-based approach is the use
of models.
• GOMS (goals, operators, methods and
selection)
Cont…
• Design rationale provides a framework in
which design options can be evaluated.
• Dialog models can also be used to
evaluate dialog sequences for problems.
The End