Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Costs are considered on CPM only and not in PERT
PERT deals with events and CPM with activities
Critical path is determined in PERT only
Guessed times are used in PERT and evaluated times in CPM

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Industrial Engineering and Production Management
Travel charts provide

An idea of the flow of materials at various stages
A compact estimate of the handling which must be done between various work sections
The information for changes required in rearranging material handling equipment
An approximate estimate of the handling which must be done at a particular station

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Industrial Engineering and Production Management
Work sampling is applied for

Estimation of the percentage utilization of machine tools
Finding out time standards, specially where the job is not repetitive and where time study by stop watch method is not possible
Estimating the percentage of the time consumed by various job activities
All of these

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