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

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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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