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objective, (2) a series of events, (3) a specific time for each event, and (4) a specific starting point (Sisk, 1994, pp. 486-497). Although the events in a series must be interrelated, they must also be separate and clearly definable. If events cannot be effectively separated from one another, they are not amenable to scheduling and control through application of the network concept. It must be possible to both estimate and measure the time required for the completion of each event in a series, before the network concept may be used effectively in the scheduling and

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