Construction Planning and Management
If to, tp and tm are the optimistic, pessimistic and most likely time estimates of an activity respectively, the expected time t of the activity will be

to + 4tm+ tp/4
to + 4tm+ tp/6
to + 3tm+ tp/3
to + 4tm+ tp/5

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Construction Planning and Management
Free float for any activity is defined as the difference between

its earliest finish time and earliest start time for its successor activity
its latest finish time and earliest start time for its successor activity
its latest start time and earliest start time
its earliest finish time and latest start time for its successor activity

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Construction Planning and Management
Batching refers to

Adjusting the water to be added in each batch according to the moisture content of the materials being mixed in the batch
Controlling the quantity of each material into each batch
Controlling the total quantity at each batch
Weighing accurately, the quantity of each material for a job before mixing

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Construction Planning and Management
Latest start of an activity is always

equal to latest event time of preceding node
less than latest event time of preceding node
less than or equal to latest event time of preceding node
greater than or equal to latest event time of preceding node

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