Put in the slack time in the space provided in the activity card. Calculating Slack Time on PERT Chartįinally, to calculate the slack time for each activity, either subtract late start from early start or subtract late finish from early finish. Where there are two or more successor activities, use the smallest late start time from among all of the activities, as the latest finish time. The latest start time can be calculated by subtracting the duration for each activity from its latest finish time. For this, the calculations will begin backward, from end toward start, and the maximum time needed to complete the entire project should be used as the late finish time for all the final activities. The next thing needed to calculate slack time is to determine the latest start and finish times for each activity. In case there are too many preceding activities, use the finish time of the activity which ends after all the others. The early start time for the subsequent activities will be the early finish time of the preceding activity. To start filling in the time details into the activity card, begin from the first activity and fill in the early start and early finish time for each activity.
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All activities which return a ZERO as the slack time, are the critical activities.
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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.
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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.
#Pom qm crashing how to
This article will show you how to calculate slack time for your projects.
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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.