A PERT chart is a project management tool used to schedule, organize, and coordinate tasks within a project. 

PERT stands for Program Evaluation Review Technique, a methodology developed by the U.S. Navy in the 1950s to manage the Polaris submarine missile program.

PERT is a method of analyzing the tasks involved in completing a given project, especially the time needed to complete each task, and to identify the minimum time needed to complete the total project.

Critical path is the sequence of activities between a project’s start and finish that takes the longest time to complete.

Program Evaluation and Review Technique (PERT) and Critical Path Method (CPM) help managers to plan the timing of projects involving sequential activities.

PERT/CPM charts identify the time required to complete the activities in a project, and the order of the steps.