A subject is the person who participates in the examination.
Factors to consider in subject selection:
- 1. the subject's previous experiences
- 2: the level of skill
- 3. the number of subjects needed (n > 6).
Single case study (n=1) when:
- Time is limited; the type of subjects are in short supply;
- general knowledge about human factors are of
- interest; and when generalisation is not important.