A Warnier/Orr diagram (also known as a logical construction of a program/system) is a kind of hierarchical flowchart that allow the description of the organization of data and procedures. They were initially developed in France by Jean-Dominique Warnier and in the United States by Kenneth Orr. This method aids the design of program structures by identifying the output and processing results and then working backwards to determine the steps and combinations of input needed to produce them. The simple graphic method used in Warnier/Orr diagrams makes the levels in the system evident and the movement of the data between them vivid.
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“If a fish is the movement of water embodied, given shape, then cat is a diagram and pattern of subtle air.”
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