At least two perspectives of design activity are per the action-centric perspective. Both involve three ordinary activities.
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A layout procedure is a widespread philosophy which may or won't comprise a guide for particular methods. Some are to lead the general goal of the design. Different systems are to steer the tendencies 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 goals and objectives. A "move" is a tentative layout decision. The analysis approach could lead to further moves 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 exchange between its 3 titular activities. Sensemaking comprises both framing and comparing moves. Implementation is the method of constructing the layout object. Coevolution is "the method in which the layout agent simultaneously refines its intellectual picture of the design item based on its mental image of the context, and vice versa"