• First domain expert:
  - identifies critical tasks;
  - sets context of task;
  - assumptions about user population.
  
  
  
• `Walk through' task:
  - predict pitfalls for the user;
  - use these in design/tests.
  
  
  
• Cognitive walkthroughs:
  - classify mental activities;
  - `premature loss of goal';
  - `supergoal kill-off'.