HCI 7 (Evaluation: Analysis)

While quantitative analysis has structure of integers or real numbers (e.g. number of errors, gps tracking, completion time etc), qualitative analysis is everything else (e.g. preferences, categories of action etc)

qualitative - post-tasl interview with specific questions such as "how easy did you find to complete the task of opening a new document?" / "did you find the interface visually appealing?"

quantitative - completion time in order to directly relate to / assess learnability

Validity - how much can we generalise from a few examples; are these representative interactions?

Reliability - would another evaluator reach the same conclusions?

Lack of structure in conclusions drawn - are these more than just a random collection of issues?

• Mode – most frequently occurring value
• Median – splits data set in two halves
• Mean – sum of values divided by number of values