How to Use Pert/CPM

Use a PERT/CPM diagram to plan your project time wisely

A PERT (Program Evaluation Review Technique) diagram is a project management tool used to schedule, organize and coordinate project tasks. This methodology is also known as the Critical Path Method (CPM.) Use a PERT/CPM diagram to identify the project tasks and milestones, figure out the right sequence, create a diagram, estimate the amount of time needed for each task and assess the critical path to ensure project success. This is particularly important for complex, global projects.

Things You'll Need

• PERT chart software

Instructions

Using a PERT/CPM Diagram

1. Identify tasks and milestones. Tasks are things that need to be done. These tasks include creating a project plan, producing products and performing quality checks. Milestones signify end points in the project tasks.

2. Figure out the right order. Analyze project tasks and associated resources to determine the most efficient way to get them done. Use a PERT diagram to help you depict tasks with dependencies on other tasks.

3. Create a diagram. Create a diagram, using computer software such as Microsoft Visio or draw it manually. Use lines to denote tasks and circles to denote milestones.

4. Estimate time associated with each task. Typically, you denote time in days or weeks. Determine the shortest amount of time the task can be completed (known as optimistic time), most likely time needed and the longest amount of time that the task might necessitate (known as pessimistic time). You can calculate the expected time based on these values. The formula is typically expected time = (optimistic time + 4 x most likely time + pessimistic time) / 6. If you are using computer software, it may calculate this for you.

5. Determine the Critical Path. The difference in the latest and earliest finish of each task is known as slack. The critical path is the sequence through the diagram in which no task has slack. Use your diagram to explain the shortest time the project can be completed in and the tasks that directly affect the schedule. Use the diagram to prioritize activities and possibly schedule more tasks in parallel by adding more resources. Recognize that these are estimates and your project planning should go smoothly.

References

• Project Management Institute
• Microsoft PERT Charts
• Definition of CPM in Microsoft Project

Resources

• Read this Article in Spanish