How Pert Is Calculated

PERT is an estimating technique that uses a weighted average of three numbers (see below) to come up with a final estimate. The resulting PERT estimate is calculated as (O + 4M + P)/6. This is called a “weighted average” since the most likely estimate is weighted four times as much as the other two values.

What are the 3 time estimates used in PERT?

To perform PERT analysis, you need to provide three estimates of activity duration: a pessimistic estimate (tp), an optimistic estimate (to), and a modal estimate ™. These three estimates are used to obtain a weighted average that is assumed to be a reasonable estimate of the activity duration.

What is slack time?

Slack time is actually a professional term used in project management to help people figure out just how much time is available between the various steps of a project. It tells you just how much time you have to start a project to keep the project on time.

Elena Rostova

Elena Rostova

Lead Health, Wellness & Medical Journalist

Elena Rostova holds a Master's degree in Public Health Journalism. She covers groundbreaking medical research, holistic wellness trends, mental health awareness, and nutritional science.

Share this article
Twitter Facebook Pinterest