Industrial Engineering and Production Management
Travel charts provide

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

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Industrial Engineering and Production Management
When slack of an activity is positive

The activity is critical and any delay in its performance will delay the completion of whole project
Any one of the above
It represents that a programme falls behind schedule and additional resources are required to complete the project in time
It represents a situation where extra resources are available and the completion of project is not delayed

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