Slack Time and Critical Paths.docx - Slack Time and...

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Slack Time and Critical Paths Introduction The project schedule displays the times for each activity in the project as well as the estimated completion time for the project. When developing the schedule, it is not indicated if there is free time in any of the activities or extra time built in for each activity. In a perfect world, projects would be completed on time without delays, but not considering the chance of a delay is not practical. Learning Materials Slack Time or Free Time After the earliest and latest times for each activity have been calculated, the amount of slack time or fee time for each activity should be considered. By definition, slack time is the amount of time that an activity can be delayed without delaying the entire project. The formula for slack time is latest start time (LST) − earliest start time (EST) or latest finish time (LFT) − earliest finish time (EFT). Project Network Example The table below displays the times for each of the activity in the project network example. Notice the following: Activity B and activity D have slack times that are nonzero. Activity B has a slack time of 2 weeks, and activity D has a slack time of 1 week. A slack time of 2 weeks for activity B implies that activity B may be delayed up to 2 weeks without delaying the entire project.

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