Business

Difference Between PERT and CPM

Main difference

Project management is a crucial task in any business enterprise. Mismanagement can lead to delays or exceeding the amount of that product to the prescribed budget, which results in the loss and embarrassment of the company. So, whenever the company and organizations are up to the project, they test statistical methods to ensure that the work is done on time and the cost is managed within the allocated budget. Project Review and Management Technique (PERT) and Critical Path Method (CPM) are two statistical techniques that work fast and efficient project completion. Both techniques are quite different from each other as CPM is the technique based on costs, while PERT is the time-based technique. CPM is the method used in products that have predictable tasks; as well as construction projects. On the other hand, PERT is the method used for unpredictable tasks; as well as development and research projects.

Comparison chart

IMPERTINENT CPM
Applicable PERT is just the time-based technique. CPM is the technique based on both time and cost.
nature of the project PERT is quite useful when dealing with unpredictable tasks and activities, as it assesses the total time needed to complete the project and deals with uncertainties, if any. CPM is highly recommended by experts for conventional projects that are part of predictable tasks and activities.
project example PERT is useful for research and development project as they are part of the unpredictable tasks and activities. CPM is useful for construction projects as it is part of predictable tasks and activities.
nature of technique PERT is the probabilistic project management tool. CPM is the deterministic management tool.

What is PER?

PERT is the statistical management technique, which is applied to ensure that projects are carried out within the established deadline. This technique was first introduced in the 1950s, with the goal of managing project time and cost. It is very useful when dealing with unpredictable tasks and activities as it assesses the total time needed to complete the project and deals with uncertainties if any. Projects like scope and development can witness unpredictable roadblocks, this technique ensures that these uncertainties are controlled in such a way that they have no effect on the cost and time limit allotted for that project. When the project is ready, using the PERT technique, the planning, programming, control, coordination and control of unpredictable activities. More principally, using this technique, three estimates of the time required are made; the most promising, the most probable and the most unfavorable. The technique is essential to access the required time, which leads to the completion of the project before the due date. The activities are also divided and the time required for each of them is also estimated, and following the critical path (longest path that connects all the tasks) is evaluated.

What is CPM?

CPM is the statistical management technique, which is equally fundamental in managing both the time and the cost of the project. CPM is useful for projects that have fairly predictable activities such as construction projects. It is both the time and cost based algorithm that gives a clear estimate of the cost required to finish the project within the given time. It also decides which aspect of the project should be scaled down or scaled up when compensation is needed. This technique was put into practice in the late 1950s; evaluates the earliest and latest possible start time for each of the split tasks in the entire project. The path is defined as the sequence of activities in the network, and the critical path is the one with the longest length.

PERT vs. CPM

  • CPM is both the time and cost based technique while PERT is just the time based technique.
  • PERT is quite useful when dealing with unpredictable tasks and activities, as it assesses the total time needed to complete the project and deals with uncertainties, if any. On the other hand, CPM is highly recommended by experts for conventional projects that are part of predictable tasks and activities.
  • CPM is useful for construction projects as it is part of predictable tasks and activities. Contrary to this, PERT is useful for the research and development project as they are part of the unpredictable tasks and activities.
  • CPM is the deterministic management tool, while PERT is the probabilistic project management tool.

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