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Issue No. 02 - February (1975 vol. 8)
ISSN: 0018-9162
pp: 50-56
W.L. Harper , Data Monitor Systems, Inc.
Obtaining quality documentation is one of the most difficult jobs in the analysis, design and development of a data processing system. Most DP systems require three types of documentation before a system becomes operational. These three types are the results of three evolutionary phases in the installation of a given system. Figure 1 depicts the evolutionary phases and defines the three types of documentation required. Actually, there are four phases and four types of documentation in the life of a system. The fourth phase is the System Maintenance Period of an ongoing system, and the fourth type of documentation is the User Reference Documentation.

W. Harper, "Special Feature: Building EDP Success by Standing on Shoulders," in Computer, vol. 8, no. , pp. 50-56, 1975.
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