(PUBLIC REVIEW DRAFT) 10S-90: Cost Engineering Terminology (Rev. April 18, 2024)

PERT (Performance Evaluation and Review Technique) is a similar methodology to that of CPM (Critical Path Method) analysis with the most significant difference being that rather than based upon activities of estimated duration starting and ending at points in time, PERT is based upon milestone (or points in time) separated by logic restraints of estimated duration. The estimate of duration of an activity of usually well known scope is typically more certain than the estimate of a logic restraint and less well developed scope between two milestones. For that reason the estimate for CPM is usually a set duration while for PERT the estimate is a range, although this aspect is subject to variation in either format.