Industrial Engineering and Production Management
Pessimistic time is

The maximum time which an activity might require
The minimum time in which an activity can possibly be accomplished
The average time required for a job
The most probable time considering all conditions

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

It represents a situation where extra resources are available and the completion of project is not delayed
Any one of the above
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

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