Information on what types of dependencies exist and how to set them up in MS Project can be found in other articles.

Lags and leads can be used in all types of dependencies.

For example, an author is writing a book text, an editor is editing it. If you arrange the tasks sequentially, it will take a lot of time to complete them. It makes no sense to fully parallelize tasks, because the editor will have nothing to do in the beginning. Let’s set the second task with a time shift at the start (with a lag) for 1 week. By the end of this week, the author will already prepare some material for editing.

Or some work can be started when the previous one is not yet completed, for example, 5 days before the end of the predecessor.

Delays and leads can be set both in the Task Dependencies window (double click on the arrow between tasks), and in the Task Information window on the Predecessors tab (double click on the task), and in the Task Details Form (Details button on the Task tab), and in the Predecessors column.

Delays are set with a + (plus) sign, leads are set with a - (minus) sign.

Dependency syntax:

predecessor task number_dependency type_plus or minus_value of delay or lead

Examples:

1FS-5d Task can start no earlier than 5 days before task 1 ends.

1SS+1.5w Task can start no earlier than 1.5 weeks after task 1 starts.

2FF-1mo Task can end no earlier than 1 month before task 2 ends.

Also, delays and leads can be set with relative values (in % of the duration of the predecessor).

Examples:

1FS-50% Task can start no earlier than halfway through task 1.

1SS+50% Task cannot start earlier than when half of task 1 is completed.

This method is convenient when the duration of the predecessor task may change. Then the program will recalculate the deadlines for the successor.

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