The results of a mathematical analysis of the standard assumptions used in PERT (Program Evaluation and Review Technique) calculations. This Memorandum attempts to indicate the magnitude and direction of errors introduced by these assumptions and to restate the mathematical aspects of the PERT Model for a better understanding on which to base further study. Techniques are suggested by which the networks might be condensed for simplification, and new criteria of criticality are discussed that could provide more valid information than do present PERT procedures.
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