If t is the duration of an activity, t_{1} is the latest finish possible moment of its preceding activity and t_{2} is the earliest start possible moment, the independent float of the activity is
If a is the optimistic time, b is the pessimistic time and m is most likely time of an activity, the expected time of the activity, is
If t_{o}, t_{p} and t_{m} are the optimistic, pessimistic and most likely time estimates of an activity respectively, the expected time t of the activity will be