Program evaluation and review technique (PERT)

The Program Evaluation and Review Technique (PERT) is a method used in project management for planning, scheduling and coordinating the tasks of a project. It is based on a network diagram analysis of the different tasks that are involved. PERT is specifically suited for large, complex and nonrepititive projects, since the network diagram varies in each project.

General overview

- General presentation of the method (purpose, history) - How it works more or less - Difference compared to other similar methods (CPM)

Key concepts

- Definition of the key concepts that will be used

   - Activities
   - Events
   - Network diagram and analysis
   - Critical Path

PERT has several concepts that need to be defined, to understand the concept of the method. Those are :

• Activities
• Events
• Network diagrams
• Critical path

A network diagram is a visual representation of a project's schedule. It presents all the information about the project on a time basis like the tasks, their starting/ending times, total duration. Using this kind of representation makes the whole management process much easier and less error-prone (to be checked).

The activities are the tasks that need to be completed. Each task has a predefined duration, a priority, a cost and an amount of workers associated with it. On a network level, they are represented as nodes connected by arrows. They can have predecessors - other tasks that need to be completed before them - and successors - tasks that can start only once this one has finished.

The events are points in time marking a phase of an activity like the start or the completion. Events can relate to one or more activities.

The critical path is the path through the network that includes the most time-consuming sequence of events and activities. Hence it represents also the total time that will be needed to complete the project. Any delay that occurs in one of the activities on this path will affect the completion date.

The process

- Detailed step by step presentation of the method

   - building a network diagram
   - calculation of the times
   - possible modifications

Applications and limitations

- Where is the method most useful and why - Why it cannot be used in other areas or is less efficient - Possible future ?