Human-Computer Interaction 3e Dix, Finlay, Abowd, Beale
Suggest potential ways of improving the interface to avoid a similar problem recurring.
answer available for tutors only
Several ideas in the answers for exercises 5.2 and 5.3. Here are a few more ...
Have a separate CONFIRM button on the
Alarm control panel, making it flash so it is more
readily seen in peripheral vision.
Distinguishing red from temporary red state by flashing the red light would also help prevent the initial mode error.
When the user tries to select a target and enter a value, a warning of some sort should be issued. This could simply be a 'this doesn't work' beep, but better would be a warning written on the manual override panel which perhaps lights up when not in RED alarm state.
Other exercises in this chapter
ex.5.1 (tut), ex.5.2 (tut), ex.5.3 (tut), ex.5.4 (tut), ex.5.5 (tut), ex.5.6 (ans), ex.5.7 (tut), ex.5.8 (tut), ex.5.9 (tut), ex.5.10 (tut), ex.5.11 (tut), ex.5.12 (tut)
all exercises for this chapter