UID

UID

1. Design & Usability

   • How good is the UI according to Design/usability Principles? Usability: How well users can use the system's functionality. Usability dimensions:Learnability, Efficiency, Safety, Ergonomics & Aesthetics (satisfaction, happiness, pleasure)
   • Learnability
     • Is it easy to learn? Users learn by doing but also look for things they recognise.
     • Recognition vs Recall
       • Affordance & Feedback
       • Metaphors
       • Consistency
     • Conceptual models
     • Interaction style
       • Command language
       • Menus & Forms
       • Direct Manipulation
       • Speech dialog
   • Efficiency & Ergonomics
     • Once learnt, is it fast to use?
     • Ergonomics: Comfort, fatigue; designing and arranging things people use so that people and things interact most efficiently and safely with it.
     • Natural Mapping
     • Gasgalt principles
     • Fitts' Law
       • Stearing
   • Safety
     • Are errors few and recoverable?
     • Reversibility
     • Error messages
     • 'Help'; User control & freedom

2. Evaluation

   • Techniques for evaluating and measuring usability
   • Task analysis
     • The process of learning about ordinary users by observing them in action to understand in detail how they perform their tasks and achieve their intended target.
     • Know the user
       • Age, gender, culture, language Education (literacy? numeracy?) Physical limitation Computer experience Motivation, attitude
     • Include the user
       • User interviews and direct observation; including the user directly on the design team.
   • User Testing
     • Quantifying all measures of usability by carrying out formative evaluation or controlled experiments that test usability hypothesises
     • Format evaluation
       • Qualitative observation:    - Find problems for next iteration of design
       • Data analysis
         • Avarage/mean
         • Statistical Inference
       • System Usability Scale
     • Controlled Experiment
       • Ethics
       • Hypothesis
         • Dependant variables
         • Independent variables
       • External Validity
       • Internal Validity
       • Reliability
         • between-subjects
           • Innate differences
         • Within-Subject
           • Order carryover effect