Activity Crashing – Part 1

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When we determine the duration of the project using the critical path method, we determine the duration estimate of the project. In some cases, we may find out that the duration is too long for the sponsor or our client and we have to reduce the duration using a duration reduction method like activity crashing.
In this first part, I will address the principle of crashing and how we can calculate the crash cost per time unit of the activities.
The information we start from is the normal duration of the activity and its total cost. For each activity, we have to determine the time we can crash the activities which lead to the crashed duration and of course what is the extra cost we have because of the crashing. The result here is the crashed time and the crashed cost.
The relationship between duration and cost is assumed to be linear and we can use the slope equation of a line to determine the crash cost per time unit or period.

Part 2: Application of the crashing on the project
Part 3: Overview of the project cost as a function of duration and conclusions

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