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

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

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Industrial Engineering and Production Management
Travel charts provide

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

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