A number of graphic notations for describing Ada programs have been proposed. In general, these are not supported by off-the-shelf tools; they are perceived by nonexperts as incomprehensible; they obscure simple design deficiencies; and they cannot adequately represent design overviews. To address these problems, a simplified graphic notation has been developed and used in a large Ada application at GTE Government Systems Corporation, in Rockville, Maryland. The notation consists of three interrelated diagrams based on extensions of structure chart concepts.

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