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Lead
What is the difference between lead and lag time?
RE: Lead
LAG
A delay on the link between a predecessor and a successor; for example to create a 5 day delay between finishing one task and starting another. Lag times can also be a percentage of the duration of the predecessor task. A negative value against a lag is known as a lead.
LEAD
An overlap between a predecessor and a successor. For example, if a task can start when its predecessor is half finished, use a finish-to-start dependency with a lead time of 50 percent. Lead time is entered as a negative lag value.