EXERCISE 7.10 [extra - not in book]
Can principles be used to prove the usability
of a system? Justify your answer.
answer available for tutors only
They can't prove it but can help demonstrate
it. Since principles of software ergonomics are ill
defined, could argue that usability principles offer
a means of defining software usability. For example:
- Predictability: support for
the user to determine the effect of a future action
based on past interaction.
- Consistency: Likeness in input/output
behaviour arising from similar situations or actions.
- Generalizability: support for
the user to extend knowledge of a specific interaction
within and across applications.
If a system supports these principles
it is more likely to be usable than if it does not.
Other exercises in this chapter
ex.7.1 (ans), ex.7.2 (ans), ex.7.3 (open), ex.7.4 (ans), ex.7.5 (ans), ex.7.6 (ans), ex.7.7 (tut), ex.7.8 (tut), ex.7.9 (open), ex.7.10 (tut), ex.7.11 (tut), ex.7.12 (tut), ex.7.13 (tut)
all exercises for this chapter