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Software engineering may be defined as the systematic design and development of software products and the management of the software process. Software engineering has as one of its primary objectives the production of programs that meet specifications, and are demonstrably accurate, produced on time, and within budget. This paper in five parts discusses the principles and practices used by the IBM Federal Systems Division for the design, development, and management of software. Part IV, on software engineering development practices, discusses a methodology for translating designs into software products. The subject is treated under two main headings, code management and integration engineering. These are rigorous methods for building the parts and integrating them into the whole software product that meets the design specifications.