consuming time and resources. The objective of CPM and PERT is to provide analytic
means for scheduling the activities. Figure 6.38 summarizes the steps of the techniques.
First, we define the activities of the project, their precedence relationships, and their
time requirements. Next, the precedence relationships among the activities are represented
by a network. TIle third step involves specific computations to develop the time
schedule for the project. During the actual execution of the project things may not proceed
as planned, as some of the activities may be expedited or delayed. When this happens,
the schedule must be revised to reflect the realities on the ground. This is the
reason for including a feedback loop between the time schedule phase and the network
phase, as shown in Figure 6.38.