The action-centric perspective is a label given to a collection of interrelated concepts, which are antithetical to the rational model. It posits that implementation is the process of constructing the design object. Coevolution is “the process where the design agent simultaneously refines its mental picture of the design object based on its mental picture of the context, and vice versa”.

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In the reflection-in-action paradigm, designers alternate between “framing”, “making moves”, and “evaluating moves”. “Framing” refers to conceptualizing the problem, i.e., defining goals and objectives. A “move” is a tentative design decision. The evaluation process may lead to further moves in the design.

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The concept of the design cycle is understood as a circular time structure,

A design approach is a general philosophy that may or may not include a guide for specific methods. Some are to guide the overall goal of the design. Other approaches are to guide the tendencies of the designer. A combination of approaches may be used if they don’t conflict.