Project management entails planning, scheduling, executing, monitoring, and controlling different projects in a business organization. It uses both PERT and CPM techniques.

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The article provides detailed insight into the difference between PERT and CPM with examples for easier understanding. Let’s jump into the topic.

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What is PERT?

PERT stands for project evaluation and review technique. The technique helps to understand planning, arranging, scheduling, coordinating, and governing the project.

PERT is commonly used in events and activities. It was developed in the 1950s with the aim of reducing cost and time for production.

Advantages of PERT

Ideal for planning large projectsHelp to show the critical path in a clear wayHelp to provide progress and completion report of the projectHelp improve communication between different departmentsHelp identify risks linked to the project

Disadvantages of PERT


Time-consuming techniqueTend to entail subjective analysisPrediction tend to be inaccurateThe method is generally expensive

What is CPM?

CPM stands for the Critical Path Method. This is a statistical method used to manage the activities of a project. Besides that, it helps reduce time and differentiate between critical and non-critical tasks.

Advantages of CPM

Help recognize critical activitiesImprove the productivity of a business organizationManage resources effectively and efficientlyOutline long term coordination of projects and planningHelp in scheduling and controlling projects

Disadvantages of CPM


Difficult for beginners to understandToo expensive to acquire the softwareTime-consuming when structuring the CPMDifficult to allocate resourcesControlling and scheduling activities is difficult

Comparison Chart: PERT Vs CPM

Basic TermsPERTCPM
Stands ForProject Evaluation Review TechniqueCritical Path Method
MeaningThe technique used to manage uncertain activities of a projectThe statistical technique used to manage the activities of a project
MethodControl timeControl cost and time
EvolutionResearch and development projectConstruction of project
ManagesUnpredictable activitiesPredictable activities
OrientationEvent-orientedActivity-oriented
ModelProbabilistic ModelDeterministic Model
EstimatesThree-time estimatesOne time estimate
Appropriate forHigh precision time estimateReasonable time estimate
Nature of jobsNon-repetitive natureRepetitive nature
Critical and Non-critical activitiesNo differentiationDifferentiated
Crashing conceptNot applicableApplicable

Differences Between PERT and CPM

PERT is a technique of planning, scheduling, controlling, organizing, and coordinating uncertain activities whereas CPM is a statistical method of planning, scheduling, organizing, coordinating and controlling well-defined activitiesPERT is a technique of planning and controlling time while CPM is a technique of controlling cost and timePERT came as a result of the research and development of projects while CPM as a result of the construction projects.The model of PERT is probabilistic whereas that of CPM is deterministic.PERT has three times estimates while CPM has only one time estimatesPERT has a high precision time estimate whereas CPM has a reasonable time estimate.PERT deals with unpredictable activities whereas CPM deals with predictable activitiesPERT deals with jobs that are non-repetitive whereas CPM deals with repetitive projects.CPM has boundaries between critical and non-critical activities unlike in PERTPERT is ideal for research and development projects while CPM is suitable for non-research projects.The crashing concept is applicable in CPM to reduce time while not applicable to PERT.PERT is set according to events while CPM align with activities

Comparison Video

Summary


The core difference between PERT and CPM is Pert deals with unpredicted activities while CPM with predicted activities. Besides that, both are essential in the reduction of production cost and time.


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