Estimates of work planning parameters are established and maintained.

Work planning parameters include all information needed by the work group to perform necessary planning, organizing, staffing, directing, coordinating, reporting, and budgeting.

Estimates of planning parameters should have a sound basis to instill confidence that plans based on these estimates are capable of supporting work objectives.

Factors to consider when estimating these parameters include work requirements, including product requirements, requirements imposed by the organization, requirements imposed by the customer, and other requirements that affect the work.

Additional factors for services include the service strategy, identified services and service levels, and how incidents and requests are to be handled.

Documentation of the estimating rationale and supporting data is needed for stakeholder review and commitment to the plan and for maintenance of the plan as the work progresses.