What is Project Slack?

Slack is the difference between the scheduled completion date of a task and its required date, where the required date is later than the completion date. When there is slack in a task, a project manager can choose to delay the start of the task, allocate fewer resources to it, or conduct the task in the usual manner and preserve the slack in case there are delaying problems later in the project. There is no slack in the critical path of a project, which is the sequence of activities that determine a project’s minimum possible duration.