The notations and parts of a process for Structured Analysis and Structured Design are formalized within a program design calculus. The formalizations are used in an application of a meta-method for formal method integration, combining SA/SD and the program design calculus of Hehner. The methods are combined so as to provide more more rigor to the informal method, and to make the program design calculus more applicable for use in large-scale systems development. Two integrations are proposed, and the two approaches are applied in some detail to an example.

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