Cost-Justifying Usability, 2nd Edition

Guilford’s four stages resemble the Gould and Lewis (1985) approach to inter-

face design, with its stages of analysis, design with diagnostic testing, and evalu-

ative testing.

Guilford’s description of the four stages of the creative process can be

applied more specifically to the design process. First, an interface designer or

design team becomes aware of an existing problem, for example, a client pre-

sents a problem or a particular project requires a design. The designer then pro-

duces a variety of possible solutions to the problem (i.e., designs). Typically,

reaching the design solutions involves many arbitrary decisions from a vast array

of choices. ...