Editing Dependency (project management) (section)

=== Leads and lags ===
Dependencies can be modified by leads, and lags. Both leads and lags can be applied to all 4 types of dependencies.

[[A Guide to the Project Management Body of Knowledge|PMBOK]] defines '''lag''' as "the amount of time whereby a successor activity will be delayed with respect to a predecessor activity".
 
For example:
When building two walls from a novel design, one might start the second wall 2 days after the first so that the second team can learn from the first.  This is an example of a ''lag'' in a Start-Start relationship.

In accordance to [[A Guide to the Project Management Body of Knowledge|PMBOK]] a '''lead''' is "the amount of time whereby a successor activity can be advanced with respect to a predecessor activity For example, on a project to construct a new office building, the landscaping could be scheduled to start prior to the scheduled punch list completion. This would be shown as a finish-to-start with two-week lead".<ref name=PMBOK/>