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Evaluation Techniques (Evaluation (Goals (Assess extent of system…

- - - - Interaction impact on the user
      - Cognitive processes required
      - Learning problems that may occur
  - - - System behaviour is predictable
      - System behaviour is consistent
      - Feedback is provided
- - - - Simple - requires little expertise
      - Can provide useful insight
      - Can show how system is actually used
    - - Subjective
      - Selective
      - Act of describing may alter task performance
  - - - Less constrained and easier to use
      - User is encouraged to criticise system
      - Clarification possible
  - - - Analyst has time to focus on relevant incidents
      - Avoid excessive interruption of task
    - - Lack of freshness - user may not remember what they did
      - May be post-hoc interpretation of events
- - - - Fixations: eye maintains a stable position. Number and duration indicate level of difficulty wtih display
      - Saccades: rapid eye moment from one point of interest to another
      - Scan paths: moving straight to a target with a short fixation at the target is optimal
  - - - Heart activity: blood pressure, volume, pulse
      - Activity of sweat glands: Galvanic Skin Response (GSR)
      - Electrical activity in muscle: electromyogram (EMG)
      - Electrical activity in brain: electroencephalogram (EEG)
- - - - Can be varied to suit context
      - Issues can be explored more fully
      - Can elicit user views and identify unanticipated problems
    - - Very subjective
      - Time consuming
    - - Close questions: y/n; easier to analyze but an lack detail
      - Open questions: no predetermined format
    - - Long questions
      - Compound sentences (split them into two)
      - Jargon and language that the interviewee may not understand
      - Leading questions that make assumptions
      - Unconscious biases
  - - - Quick and reaches large user group
      - Can be analysed more rigorously
      - Measure something specific
      - Reliable
      - Measurements can be compared
    - - Less Flexible
      - Less probing
      - Difficult to elicit user views and identify unanticipated problems
    - - Information required e.g. usability, mental effort required, user experience
      - How to analyse answers
    - - General
      - Open-ended
      - Scalar
      - Multi-choice
      - Ranked