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Usability Evaluation - Coggle Diagram

- - - - can be varied to suit context
      - issues can be explored more fully
    - - very subjective
      - time consuming
      - interviewer can bias
    - - Plan a set of questions (provides for some consistency)
      - Don’t ask leading questions
  - - - quick and reaches large user group
      - can be analyzed more rigorously
    - - less flexible
      - less probing
    - - general
      - open-ended
      - scalar
      - multi-choice
      - ranked
      - Question format
        
        Closed format
        
        Advantages
        
        Clarify alternatives
        
        Easily quantifiable
        
        Eliminate useless answer
        
        Disadvantages
        
        Must cover whole range
        
        All should be equally likely
        
        Open format
        
        Asks for unprompted opinions
        
        May help with design ideas
    - - Discuss questions among team
      - Administer verbally/written to a few people (pilot).
      - Administer final test
  - - - Protocol analysis
        
        the record of an evaluation session
        
        paper and pencil – cheap, limited to writing speed
        
        audio – good for think aloud, difficult to match with other protocols
        
        video – accurate and realistic, needs special equipment, obtrusive
        
        user notebooks - coarse and subjective, useful insights
      - Automated analysis
        
        need an automatic analysis tools to support tasks
      - Post-task walkthroughs
        
        data obtained via direct observation lack interpretation
        
        a walkthrough - transcript played back to participant for comment
    - - Think Aloud
        
        user asked to describe
        
        Advantages
        
        simplicity - requires little expertise
        
        can provide useful insight into problems with an interface
        
        can show how system is actually use
        
        Disadvantages
        
        the info provided is often subjective and may be selective
        
        The process of observation can alter
        
        during
      - Cooperative evaluation
        
        both user and evaluator can ask each other questions throughout
        
        Advantages
        
        less constrained and easier to user
        
        user is encouraged to criticize system
  - - - Low cost
      - Shallow learning curve
      - Generate effective evaluation without professionals
    - - consistency and standards
        
        Users should not have to wonder whether words, situations or actions mean the same thing in different contexts.
      - error prevention
        
        Make it difficult to make errors.
      - recognition rather than recall
        
        Make objects, actions and options visible.
      - flexibility and efficiency of use
        
        Allow users to tailor frequent actions.
      - aesthetic and minimalist design
        
        not contain information that is irrelevant
      - Help and documentation
        
        manuals and online help are vital and are accessed usually when user is frustrated
  - - - a description of the prototype of the system
      - a description of the task the user is to perform on the system
      - a complete, written list of the actions needed to complete the task with the given prototype