At least two views of design activity are per the action-centric perspective. Both involve 3 common activities.
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A layout procedure is a general philosophy which may or might not include a aid for particular methods. Some are to lead the final target of the design. Other procedures are to steer the traits of the designer.
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In the reflection-in-action paradigm, designers exchange among "framing", "making moves", and "evaluating moves". "Framing" refers to conceptualizing the problem, i.e., defining aims and objectives. A "move" is a tentative design decision. The analysis approach might result in further strikes in the design.
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The rational model was independently developed by Herbert A. Simon,[8][9] an American scientist, and two German engineering design theorists, Gerhard Pahl and Wolfgang Beitz
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In the sensemaking–coevolution–implementation framework, designers trade between its 3 titular activities. Sensemaking comprises the two framing and evaluating moves. Implementation is the process of constructing the design object. Coevolution is "the procedure where the design agent simultaneously refines its intellectual picture of the layout item in accordance with its intellectual photograph of the context, and vice versa"