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
Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed
All of the these

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Industrial Engineering and Production Management
Time study is carried out

By breaking up each operation into small elements which are measurable with the help of the measuring device accurately
All of these
By observing and recording the time taken by the operator for an operation
By finding all the significant informations regarding the job, work place and machine tool etc

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