Introducing lead and lag time
Lead time is the period that a successor task can start before its predecessor has finished. It occurs when two tasks link and overlap. Once the successor task is underway, both tasks continue in parallel. Overlapping tasks by using lead time is a way of reducing the duration of a schedule.
The lead time is illustrated by the blue arrow in the following example:
Lag time is the gap or delay between one task ending and its successor starting. Imposing a fixed delay between two tasks is useful in certain situations. For example, you may need to introduce lag time after a task that involves painting in order to allow time for the paint to dry:
The lag time is illustrated by the blue arrow in the following example:
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