Examining the leads and lags is one way to evaluate a schedule. It is one of the tools and techniques for the sequence activities and control schedule processes. A "lead" allows an activity in the schedule to begin a set time before the predecessor activity is completed. A "lag" allows the next activity to begin a certain amount of time after the predecessor activity has begun. Both leads and lags allow the sequential activities to overlap, so they shorten or "compress" the schedule. The difference is whether the allowable overlap is measured from the start or the end of the first activity.
Leads and lags are described in PMBOK section 126.96.36.199.
- Wikipedia article on [
- PM Study Circle: Lead Time and Lag Time in Project Scheduling Network Diagram.
By Fahad Usmani.