Exam Spotlight

Leads and lags speed up or delay successor activities but should not replace schedule logic.

Let's revisit the house-painting example to put all this in perspective. In order to paint, you first need to scrape the peeling paint and then prime. However, you can't begin painting until the primer has dried, so you shouldn't schedule priming for Monday and painting for Tuesday if you need the primer to dry on Tuesday. Therefore, the priming activity generates the need for lag time at the end of the activity to account for the drying time needed before you can start painting.

Lead time works just the opposite. Suppose, for this example, you could start priming before the scraping is finished. Maybe certain areas on the house don't require scraping, so you don't really need to wait until the scraping activity finishes to begin the priming activity. In this example, lead time is subtracted from the beginning of the priming activity so that this activity begins prior to the previous activity finishing.

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Project Management Made Easy

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