Issue No.02 - February (1975 vol.8)
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.L. Harper, "Special Feature: Building EDP Success by Standing on Shoulders", Computer, vol.8, no. 2, pp. 50-56, February 1975, doi:10.1109/C-M.1975.218868