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Design as a process

Substantial disagreement exists concerning how designers in many fields, whether amateur or professional, alone or in teams, produce designs. Dorst and Dijkhuis argued that “there are many ways of describing design processes” and discussed “two basic and fundamentally different ways”, both of which have several names. The prevailing view has been called “The Rational Model”, “Technical Problem Solving” and “The Reason-Centric Perspective”. The alternative view has been called “Reflection-in-Action”, “co-evolution”  and “The Action-Centric Perspective”.

 The Rational Model

The Rational Model was independently developed by Simon and Pahl and Beitz. It posits that:

1. designers attempt to optimize a design candidate for known constraints and objectives,
2. the design process is plan-driven,
3. the design process is understood in terms of a discrete sequence of stages.

The Rational Model is based on a rationalist philosophy  and underlies the Waterfall Model, Systems Development Life Cycle  and much of the engineering design literature

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