![]() ![]() Only when the slack times have been identified will it be possible to use them to the project’s advantage. Ignoring slack time can lead to consequences that may compromise the overall performance and efficiency of the project. Slack time is a very integral part of the project process and it must be clearly shown on the PERT chart. Screenshot taken by Sidharth Thakur The Importance of Slack Time All activities which return a ZERO as the slack time, are the critical activities. ![]() Calculating the slack time is another way of tracing the critical path on a PERT chart. Slack time must be calculated for all activities involved in the project. Calculating Slack Time for Project ActivitiesĪlternatively, slack time can also be calculated as the difference between the latest finish time and the early finish time. The slack time formula is: Slack Time = LS-ES LS – the latest time when an activity must be started.ES – the earliest time when an activity can be started.There are two things that are needed to calculate the slack time: Calculating Slack TimeĬalculating the slack time for an activity in a PERT chart is very easy and does not involve any complex calculations. The activities that lie on the critical path of the PERT chart are the most significant and must be started and completed strictly without any delay, as any delays in these activities will result in an overall delay in finishing the project. This difference in time is used to determine how much an activity can be delayed while still allowing the subsequent activities and the overall project to get completed as per schedule. Calculating slack time is an important task in project management On the other hand, all activities that lie along other paths of the PERT chart will have some difference between the earliest start time and the latest start time, and between the earliest finish time and the latest finish time. #PERT CHART GANTTPROJECT HOW TO#This article will show you how to calculate slack time for your projects. For all activities that lie on the critical path the earliest start time will be the same as latest start time and the earliest finish time will be the same as latest finish time. Also known as float, slack time is applicable only to those activities which do not lie on the critical path of the PERT chart. Slack time, used in Program Evaluation and Review Technique (PERT), denotes how much an activity can be delayed beyond its earliest start date, without causing any problems in the completion of the project by its due date. ![]()
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