Industrial Engineering and Production Management
In CPM, the cost slope is determined by

Normal Cost/Crash cost
(Crash Cost - Normal cost)/ (Normal time - Crash time)
Crash cost/Normal Cost
(Normal cost - Crash cost)/ (Normal time - Crash time)

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Industrial Engineering and Production Management
PERT

Provides an approach for keeping planning up-to-date
Provides a way for management to require that planning be done on a uniform and logical basis
Permits management to foresee quickly the impact of variations from the plan
All of the listed here

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