Project Crashing Using Critical Path Method

Yogesh is a mechanical engineer and project manager based in India.

Project crashing is the name given to schedule compression techniques that are used when a person wants to shorten the duration of a project without changing the scope. There are basically two techniques that can be used to shorten project duration while maintaining project scope. These techniques are fast tracking and crashing. Cost and schedule trade-offs are analyzed to determine how to obtain the greatest amount of compression for the least incremental cost. Crashing analyzes and categorizes activities based on the lowest crash cost per unit time. Crashing only works for critical path activities where it is possible to shorten schedules. The project crashing results in a high direct cost to the project, but also gives clear identification for optimal time cost. In project management, direct cost is the basis for crashed cost calculation. Project crashing serves the purpose of effective time management.


Abbreviations and Acronyms

DC: Direct cost
IC: Indirect cost
TC: Total cost
FL: Float or slack
ES: Early start
LS: Late start
EF: Early finish
LF: Late finish
Tn: Normal time
Cn: Normal cost
Tc: Crashed time
Cc: Crashed cost
CPM: Critical path method
CP: Critical path
NCP: Non critical path
PERT: Program evaluation and review technique

(Heldman, 2011)


1. CPM Event:

2. Start and Finish Time Calculation Formulae…

Please log in or sign up below to read the rest of the article.


Continue reading...

Log In
Sign Up

"It is an important and popular fact that things are not always what they seem. For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much -- the wheel, New York, wars and so on -- whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man -- for precisely the same reasons."

- Douglas Adams