Industrial Engineering and Production Management
Discrepancies of bar chart techniques are

All of these
Free time available for an activity can't be predicted
Consequential effects of lack in one activity on the finish date
Effective monitoring/controlling can't be done

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Industrial Engineering and Production Management
Work sampling is applied for

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

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