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
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
(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
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