Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest finish time of event earliest finish time of the event
Latest start time of succeeding event earliest finish time of preceding event activity time
Anyone of the above
Latest start time of the event earliest start time of the event

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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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