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FM Critical Path

7.4 Using Crashing to Reduce Completion Time

Note: if you cannot remember how to determine the critical path of an activity network, revise notes for 7.3 Determine Critical Paths and Float Times.

Crashing

  • Crashing refers to the process of reducing the duration of one or more activity in a project and then recalculating the project duration.
  • Crashing could represent anything that reduces the duration of an activity, such as hiring more staff, favourable weather, utilising more efficient methods, etc.
  • Crashing an activity on the critical path will generally lower the project duration.
  • Crashing an activity which is not on the critical path will not change the project duration.
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7.3 Determine Critical Paths and Float Times

Note: if you cannot remember how to apply forward and backward scanning, revise notes for 7.2 Forward and Backward Scanning.

Float Times

  • The float time for an activity is the difference between its latest start time (LST) and earliest start time (EST).
  • This represents the amount of time the individual activity can be postponed without changing the duration of the project overall.

Example

Picture 5

Above is an activity network which has undergone forward and backward scanning to determine the EST and LST of each activity. The float times of each activity can be calculated from these values:

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