CPM and PERT are network-based project management techniques that model the sequence and flow of activities in a project. PERT is used for projects with uncertain activity durations, models time as a variable, and identifies the critical path to minimize time and cost. CPM assumes fixed activity durations, differentiates critical from non-critical activities to reduce delays, and deals with crashing activities to further reduce time. The key differences are that PERT is probabilistic and for non-repetitive projects like research, while CPM is deterministic and used for repetitive construction projects.

1. GOVERNMENT Engineering
College,Valsad
Topic:- Difference between CPM and PERT
Prepared By:
( Group No:- 36 )
Patel Jenil Shailesh (220193105019)
Patel Neel Rajeshbhai (220193105020)
Patel Ruchitkumar Bachubhai (220193105022)

2. Difference between CPM & PERT

3. Introduction
• Project management can be understood as a systematic way of planning, scheduling,
executing, monitoring, controlling the different aspects of the project, so as to attain the goal
made at the time of project formulation.
• PERT and CPM are the two network based project management techniques, which exhibit
the flow and sequence of the activities and events.
• Program (Project) Management and Review Technique (PERT) is appropriate for the
projects where time needed to complete different activities are not known.
• Critical Path Method or CPM, is apt for the projects which are recurring in nature.

4. PERT
• PERT is an acronym for Program (Project) Evaluation and Review Technique, in which
planning, scheduling, organising, coordinating and controlling of uncertain activities take
place.
• The technique studies and represents the tasks undertaken to complete a project, to identify
the least time for completing a task and the minimum time required to complete the whole
project.
• It is aimed to reduce the time and cost of the project.

5. • PERT uses time as a variable which represents the planned resource application along with
performance specification.
• In this technique, first of all, the project is divided into activities and events. After that proper
sequence is ascertained, and a network is constructed.
• After that time needed in each activity is calculated and the critical path (longest
pathconnecting all the events) is determined.

6. CPM
• Developed in the late 1950's, Critical Path Method or CPM is an algorithm used for planning,
scheduling, coordination and control of activities in a project.
• Here, it is assumed that the activity duration are fixed and certain. CPM is used to compute
the earliest and latest possible start time for each activity.
• The process differentiates the critical and non-critical activities to reduce the time and avoid
the queue generation in the process. The reason behind the identification of critical activities
is that, if any activity is delayed, it will cause the whole process to suffer. That is why it is
named as Critical Path Method.

7. • In this method, first of all, a list is prepared consisting of all the activities needed to complete
a project, followed by the computation of time required to complete each activity.
• After that, the dependency between the activities is determined. Here, 'path' is defined as a
sequence of activities in a network.
• The critical path is the path with the highest length.
.

8. Comparison between PERT and CPM
PERT CPM
PERT is a project management technique, used
to manage uncertain activities of a project.
CPM is a statistical technique of project
management that manages well defined
activities of a project.
A technique of planning and control of time. A method to control cost and time.
It is a probabilistic model. It is a deterministic model.
Evolved as Research & Development project Evolved as Construction project.
It does not deal with concept of crashing. It deals with concept of crashing.
It is known for non-repetitive jobs like research
and development programes.
It is used for repetitive jobs like residential
construction.
Example: Involving new activities or products,
research and development.
Example: construction projects, building off
machines, ships, etc