The major differences and similarities between pert

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The Major Differences and Similarities between PERT and CPMPERT and CPM are very similar in their approach. There are however twodistinctions that are commonly pointed out;(a) The way the activity time durations are estimated – In CPM, there is onlyone time estimation for each activity.In PERT we may have a one timeestimation for each activity, but we may also have three time estimations foreach activity that are used to compute a weighted expected time estimationfor each activity as well as a weighted expected completion time for thewhole project.PERT therefore is a probabilistic tool.The PERT timeestimation procedure can be adapted to CPM.(b) The second difference is that CPM allows an explicit estimate of costs inaddition to time.Thus while PERT is basically a tool for planning andcontrol of time, CPM can be used to control both time and costs of theproject.Extensions of both PERT and CPM allow the user to manage other resources inaddition to time and costs.The purpose of PERT/CPMPERT/ CPM provides management with the following information as a minimum:(a) Which of the activities are critical?(b) Which of the activities are non-critical?3
(c) What are the slack times for non-critical activities?The PERT and CPM ProcedureThe application of PERT/CPM may be divided into three phases: formulation(inputs), solution (outputs) and analysis and application.Formulation:Step 1 Analysis of the project – break the project down into specific tasks.Step 2 Sequence the activities – once the contend of each activity is defines,the sequence of execution id determined, i.e., in what sequence are the activities tobe handled.Step 3 Estimate the activity times (durations) and costs.Solution:Step 1 Construct the network diagram of the project.Step 2 Event analysis – (a) enter the time estimates on the network; (b)compute the earliest and latest times for starting and ending each activity; (c) findthe slack times for each activity and identify activities that are critical; (d) find thecritical path.

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Term
Spring
Professor
N/A
Tags
Project Management, Critical path method, Project Management Control

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