parameters of the part being created will change, but the preliminary design focuses on creating the general framework to build the project on.

S. Blanchard and J. Fabrycky describe it as:"The 'whats' initiating conceptual design produce 'hows' from the conceptual design evaluation effort applied to feasible conceptual design concepts. Next, the 'hows' are taken into preliminary design through the means of allocated requirements. There they become 'whats' and drive preliminary design to address 'hows' at this lower level."

Detailed design

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