PERT Chart

Definition: a PERT Chart is a project planning and scheduling method, used in project management, that is designed to analyze and represent the tasks involved in completing a given project.
The Program Evaluation and Review Technique (PERT) focuses especially on the time needed to complete each task, and on identifying the minimum time needed to complete the total project.
PERT is commonly used in conjunction with the Critical Path Method.
Unlike the Gantt Chart, the PERT has no calendar, so you can not see precisely when the activities should be performed. On the other hand, the dependencies between the activities in PERT are easier to follow.

More on pert charts. More on project planning: Front End Loading, Gantt Chart.