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Consider the following statements in respect of PERT and CPM: 1. PERT is event-oriented while CPM is activity-oriented. 2. PERT is probabilistic while CPM is deterministic. 3. Levelling and smoothing are the techniques related to resource scheduling in CPM. Which of the statements given above are correct?

Consider the following statements in respect of PERT and CPM: 1. PERT is event-oriented while CPM is activity-oriented. 2. PERT is probabilistic while CPM is deterministic. 3. Levelling and smoothing are the techniques related to resource scheduling in CPM. Which of the statements given above are correct? Correct Answer 1, 2 and 3

Explanation:

A project may be defined as a combination of interrelated activities which must be executed in a certain order before the entire task can be completed.

The aim of planning is to develop a sequence of activities of the project so that the project completion time and cost are properly balanced.

To meet the objective of systematic planning, the management has evolved several techniques applying network strategy.

PERT (Programme Evaluation and Review Technique) and CPM (Critical Path Method) are network techniques which have been widely used for planning, scheduling and controlling the large and complex projects.

  • PERT (Project Evaluation and Review Technique) approach takes account of the uncertainties. In this approach, 3-time values are associated which each activity. So it is probabilistic.

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  • CPM (Critical Path Method) involves the critical path which is the largest path in the network from starting to ending event and defines the minimum time required to complete the project. So it is deterministic.

Difference between PERT and CPM (Critical Path Method)

PERT

CPM

1. Probabilistic approach

1. Deterministic approach

2. Three-time estimate

2. One - time estimate

3. Event oriented network model

3. Activity-oriented network model

4. The slack concept is used

4. Float concept is used

5. Project crashing is not possible

5. Project crashing is possible

6. Deals with probabilistic time estimates

6. Deals with deterministic time estimates

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