Industrial Engineering and Production Management
Slack represents the difference between the

Latest allowable time and the earliest expected time
Latest allowable time and the normal expected time
Normal allowable time and the latest expected time
Proposed allowable time and the earliest expected time

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Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Activities and events are clearly shown
Activity times are clear
Early start and late finish of an activity are clearly marked
Interrelationship among activities is clearly shown

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Industrial Engineering and Production Management
Micro motion study is

Analysis of a man-work method by using a motion picture camera with a timing device in the field of view
Motion study of a sequence of operations conducted systematically
Study of man and machine conducted simultaneously
Motion study observed on enhanced time intervals

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