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1 92 Chapter 6 The process of interaction design

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6.4.3 Lifecycle models in HCI

Another of the traditions from which interaction design has emerged is the field of
HCI (human-computer interaction). Fewer lifecycle models have arisen from this
field than from software engineering and, as you would expect, they have a
stronger tradition of user focus. We describe two of these here. The first one, the
Star, was derived from empirical work on understanding how designers tackled
HCI design problems. This represents a very flexible process with evaluation at its
core. In contrast, the second one, the usability engineering lifecycle, shows a more
structured approach and hails from the usability engineering tradition.

The Star Lifecycle Model
About the same time that those involved in software engineering were looking for
alternatives to the waterfall lifecycle, so too were people involved in HCI looking
for alternative ways to support the design of interfaces. In 1989, the Star lifecycle