Human-Computer Interaction 3e Dix, Finlay, Abowd, Beale
This exercise is based on the nuclear reactor scenario on the web at: www.hcibook.com/e3/scenario/nuclear/
(a) Looking only at the STN diagrams in Figures 16.21 and 16.22 (that is ignoring for now the meaning of the various actions), identify missing elements from the STNs. Taking into account the meaning of the actions, suggest possible corrections.
(b) Taking into account now the meaning of the various states and actions, explain why you believe the consultant suggested the change from the behaviour in Figure 16.21 to that in Figure 16.22.
Figure 16.21 - STN for alarm state
Figure 16.22 - STN for revised alarm state
answer available for tutors only
Other exercises in this chapter
ex.16.1 (ans), ex.16.2 (ans), ex.16.3 (ans), ex.16.4 (ans), ex.16.5 (tut), ex.16.6 (tut)
all exercises for this chapter