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Evaluation Techs (Why ? (inherently human centered, presence of…

- - - - – what impact will interaction have on user?
      - – what cognitive processes are required?
      - – what learning problems may occur?
  - - - – system behaviour is predictable
      - – system behaviour is consistent
      - – feedback is provided
- - - - – simplicity - requires little expertise
      - – can provide useful insight
      - – can show how system is actually use
    - - subjective
      - – selective
      - – act of describing may alter task performance
  - - - less constrained and easier to use
      - – user is encouraged to criticize system
      - – clarification possible
  - - - useful to identify reasons for actions and alternatives considered
      - • necessary in cases where think aloud is not possible