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Starting in September 1981, I made a seriou s effort to learn and apply Jackson Program Desig n Methodology. This effort was motivated primaril y by personal difficulties in writing structure d programs efficiently after two decades of non-structured programming. (Jackson Program Desig n Methodology provides a systematic technique fo r developing structured… (More)
I. The Role of Systematic Indentation Many practitioners, including the author, believe that systematic indentation of DO-groups and IF-THEN-ELSEs is very helpful in improving program intelligibility. Most significantly, Professor Ben Shneiderman and three of his graduate students report in [Miar83] that "Recent studies have concentrated on program… (More)
It is not necessary to use a backward-directed GO TO in FORTRAN. In othe r words, if a FORTRAN program exists which contains backward-directed GO TOs, the n other FORTRAN program(s) exist with (1) the same functionality as the origina l program and (2) no backward-directed GO TOs. 2. Argumen t Bohm and Jacopini [Bohm66J have shown that the control… (More)
Fred Brooks summarized what he has learned about Software Engineering since the publication of "The Mythical Man-Month" (MMM): • The advantage of "incremental build". (Under incremental build, a rudimentary version of the software is built as soon as possible. The earliest version consists of a driver and stubs. Then function is added incrementally.) The… (More)
SUMMARY An unconventional, "minimum-period" COBOL coding style is described, illustrated and recommended. A simple formula is proposed that calculates the correct number of periods in a SECTIONiess PROCEDURE DIVISION written in this style. COBOL practitioners know that misplaced periods are a common source of program bugs. One reason for the trouble is the… (More)