Resource Availability and Duration Estimating
Activity duration estimation shall be based on the scope of work of each activity and productivity of the resources required for these activities.
Duration should be estimated by the project management team members who are conversant with these details. For each activity this information shall be derived from the historical data of the similar activities of previous projects, resources and project work environment and also from the experience of the project team members.
The availability of activity details defines whether the activity duration estimation will be probabilistic or deterministic. For some activities, detailed information may be available at the time of duration estimation.
But, for other activities the details shall be finalized progressively.