A Comparison of JSD and DFD as Descriptive Tools

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Abstract
There is often a need to provide an assessment of a description method to be used in a phase of systems analysis. The authors are developing a framework for assessment which is applicable to such tools. In this paper we demonstrate how the framework can be used in a general comparison of the two description methods: Jackson Systems Design and Gane and Sarson's version of Data Flow Diagrams. For completeness we provide an introductory description of the assessment technique and give examples of the use of JSD and DFD. It is claimed that the assessments that are formally based on the examples have validity beyond the narrow base of the comparison. The assessment technique assigns DFD and JSD profiles which are of use in making decisions on suitability of application.

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