Once the activities have been defined, it is necessary to estimate activity durations before a developing the schedule. The estimate activity durations process is in the PMI process group of planning and the PMI knowledge area of time management.

According to the PMBOK, this activity has the following characteristics:

Inputs Tools and Templates Outputs
schedule management plan, activity list, activity attributes, activity resource requirements, resource calendar, project scope statement, risk register, resource breakdown structure, enterprise environmental factors, organizational process assets expert judgment, analogous estimating, parametric estimating, three-point estimating, group decision-making techniques, reserve analysis activity duration estimates, project documents updates

Related: estimate activity resources

Duration is the elapsed time, usually measured in working days.

Critical path method puts the schedule reserves into the Activities. (Critical chain method handles this under risk.

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