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Reference.org
Function analysis diagram
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<p>A function analysis diagram (FAD) is a method used in <a href="/facts/Engineering_design_process/heCF3wFo">engineering design</a> to model and visualize the functions and interactions between components of a system or product. It represents the functional relationships through a diagram consisting of blocks, which represent physical components, and labeled relations/arrows between them, which represent useful or harmful functional interactions. </p>