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TIME, WEEKS

FIGURE 12-7. Comparison models for a time-phase PERT chart.

TIME, WEEKS

FIGURE 12-7. Comparison models for a time-phase PERT chart.

activities exiting the node. Figure 12-9 shows the earliest and latest starting and finishing times for a typical network.

The identification of slack time can function as an early warning system for the project manager. As an example, if the total slack time available begins to decrease from one reporting period to the next, that could indicate that work is taking longer than anticipated or that more highly skilled labor is needed. A new critical path could be forming.

Looking at the earliest and latest start and finish times can identify slack. As an example, look at the two situations below:

Situation a Situation b

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