Industrial Engineering and Production Management
The important file in making a PERT is

An event can't be accomplished until activities leading to it are completed
All of the these
Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed

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

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

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