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

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

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Industrial Engineering and Production Management
The essential condition for the decompression of an activity is that

The project time should change due to decompression
An activity could be decompressed to the maximum extent of its normal time
After decompression the time of an activity invariably exceeds its normal time
An activity could be decompressed to the maximum extent of its normal time

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Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

No time measuring devices are generally needed
Simultaneous study of many operators may be made by a single observer
Permits a fine breakdown of activities and delays
Calculations are easier, method is economical and less time consuming

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