The non-critical path(s) contains the float – the amount of time an activity can be delayed without delaying successor tasks or the project end date. We discussed float in the article defining of the Critical Path ( The Critical Path – A Tool To Keep The Project On Schedule) because the critical path has no slack or float by definition. ![]() ![]() Once the concept is understood, it is more important to understand how to leverage slack time within projects. They can be used interchangeably, therefore, our discussion of slack and float will purposely use both. Additionally, Slack is used in Microsoft Project, therefore, knowing both terms – Float and Slack – is important. Update May 2018: it appears Slack has fallen and Float is the preferred term according to the PMBOK ® Guide 6th edition, although many project managers will continue to use the term Slack. See also Free Float.įree Float: The amount of time that a schedule activity can be delayed without delaying the early start date of any immediately following schedule activities. Calculated using the critical path method technique and determining the difference between the early finish dates and late finish dates. Total Float: The total amount of time that a schedule activity may be delayed from its early start without delaying the project finish date, or violating a schedule constraint. ![]() It is listed separately in the index of the 6th edition.) See Free Float and Total Float.” It is no longer listed in the PMBOK ® Guide 6th edition separately, only under Free Float and Total Float. Float was mentioned in the PMBOK ® Guide 5th edition glossary separately and defined as “Also called Slack. It is no longer in the glossary).įloat: Also called Slack. Slack is only mentioned in the index of the PMBOK ® Guide 5th & 6th edition where is states to see Float. It is the amount of time an activity can be delayed without impacting other activities or the project end date and changes over the course of the project implementation. When leveraged properly, project managers can shift activities and resources to meet the project objectives and priorities. Slack or Float provide flexibility in the project schedule. What is Slack? What is Float? Is There A Difference? Practical Definition:
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