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When setting up links between tasks, you can specify whether any lag or lead time is built into the dependency.
Lag is the period of delay between tasks linked with a dependency. For example, two tasks are linked with a Finish to Start dependency with a lag of 1 day. The second task will start 1 day after the first task finishes. (Note: Lag time takes weekends and non-working days into account. If there is a weekend between the finish of the first and start of the second task, the second task appears to start after 3 days.)
Lead time is an overlap between tasks linked with a dependency, and can be used to specify that a successor task can start when its predecessor task is part finished. For example, if two tasks are linked with a Finish to Start dependency with a lead time of 2 day, then the second task will start 2 days before the first task finishes.
Enter lead time for a task by typing a negative number in the Lag text box of the Task Details window.
Set up lag and lead time when creating or editing a task, or in the Gantt chart Task Dependency window, accessed by clicking a dependency link between tasks in the Gantt chart:
For more information on dependencies, see the Task Dependencies Overview.
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