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<p>An integrated life-cycle model is presented for use in a software maintenance environment. The model represents information about the development and maintenance of software systems, emphasizing relationships between different phases of the software life cycle. It provides the basis for automated tools to assist maintenance personnel in making changes to existing software systems. The model is independent of particular specification, design, and programming languages because it represents only certain 'basic' semantic properties of software systems: control flow, data flow, and data structure. The software development processes by which one phase of the software life cycle is derived from another are represented by graph rewriting rules, which indicate how various components of a software system have been implemented. This approach permits analysis of the basic properties of a software system throughout the software life cycle. Examples are given to illustrate the integrated software life-cycle model during evolution.</p>
software tools; graph theory; programming environments; integrated life-cycle model; software maintenance; software life cycle; semantic properties; control flow; data flow; data structure; graph rewriting rules; data structures; graph theory; programming environments; software reliability; software tools

S. Liu, R. Nicholl, J. Tsai and S. Yau, "An Integrated Life-Cycle Model for Software Maintenance," in IEEE Transactions on Software Engineering, vol. 14, no. , pp. 1128-1144, 1988.
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