PERT vs. CPM

 

PERT vs. CPM

Here are the significant differences between PERT and CPM:

  • Technique: PERT is a project management technique used to measure uncertain activities in a project and focuses on time planning and control. In contrast, CPM is a statistical project management technique that manages the well-defined activities of a project, such as time and cost management.

  • Focus: PERT focuses on minimizing the time required to complete a project by the designated deadline. In comparison, CPM focuses on a trade-off between cost and time with a significant emphasis on minimizing costs.

  • Evolution: PERT evolved as a suitable technique for research and development projects, while CPM is best suited for non-research projects like construction.

  • Orientation: While PERT is event-oriented because it focuses on time, CPM is often activity-oriented.

  • Model: PERT uses a probabilistic model, while CPM is a deterministic model.

  • Time estimates: PERT has three-time estimates and helps make high-precision time estimates. In contrast, CPM has only a onetime estimate and is appropriate for reasonable time estimation.

  • Activities type: While the PERT technique manages unpredictable activities, the CPM can manage predictable activities effectively.

  • Job nature: PERT is beneficial for the non-repetitive types of jobs, while CPM involves jobs with a repetitive nature.

  • Crashing concept: Crashing is a compression technique used in CPM to reduce the project duration and associated costs. In comparison, the crashing concept does not apply to PERT as there's no time certainty.

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