Human-Computer Interaction 3e Dix, Finlay, Abowd, Beale

exercises  -  13. socio-organizational issues and stakeholder requirements

EXERCISE 13.7 [extra - not in book]

(Cross refer to ch 12) Soft systems methodology and cognitive psychology offer different perspectives on HCI. For each of these

(a) Summarise the view of HCI taken, and the contribution to HCI made, by the perspective.
(b) What view of users and tasks is taken by the perspective?
(c) What tools and methods does the perspectives provide to assist interface designers?
(d) How do these different perspectives relate to each other?

answer available for tutors only

Soft Systems Methodology

(a) System incorporates the technology, the people, the procedures etc so design must analyse the whole context. Contribution: contextualised analysis of impact of technology.
(b) User is part of larger system. Other stakeholders are also important. Tasks are transformations.
(c) Rich picture can help to clarify context of interactive system. SSM worked through identifies the necessary transformations and the effects on the whole systemof the new technology. Answer would discuss stages of SSM.

Cognitive Psychology

(a) Can use cognitive models of users to predict how they will perform with an interface. Contribution: predictive models of interactive behaviour.
(b) User is generic and (usually) assumed error-free. Model is of cognitive processes. Takes little account of context. Tasks are low level - often unit tasks.
(c) Techniques - range of models available - including GOMS, TAG, CCT. Expect some explanation of one or more of these and an example.
(d) The answer should consider differences and similarities in views of user, task, importance of context and methods.

Other exercises in this chapter

ex.13.1 (ans), ex.13.2 (ans), ex.13.3 (tut), ex.13.4 (tut), ex.13.5 (tut), ex.13.6 (tut), ex.13.7 (tut), ex.13.8 (tut), ex.13.9 (tut), ex.13.10 (tut), ex.13.11 (tut)

all exercises for this chapter

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