CPM AND PERT
CPM
(Critical Path Method) and PERT (Program Evaluation and Review Technique) are
network-based methods designed to assist in the planning, scheduling, and
comrol of projects. A project is defined as a collection of interrelated
activities with each activity
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 repre-sented 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 pro-ceed as planned, as some of
the activities may be expedited or delayed. When this hap-pens, 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 net-work
phase, as shown in Figure 6.38.
The two
techniques, CPM and PERT, which were developed independently, dif-fer in that
CPM assumes deterministic activity durations and PERT assumes proba-bilistic
durations. This presentation will start with CPM and then proceed with the
details of PERT.
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