Projects vary in duration, value, and complexity. On a large or complex project, the Project Manager may elect to appoint one or more Assistant Project Managers. The Project Manager may delegate single or multiple responsibilities, including budget responsibility to an Assistant Project Manager. The Project Manager may direct the Assistant Project Manager to control all work performed within the framework of various assigned WBS legs. This includes defining work scope, authorizing work, assigning and controlling budgets, and monitoring progress.
Most companies operates under a functional organization structure.
The functional organization maintains adequate technical resources and disciplines within their own organization entities. The Project Manager must provide written direction to the various functional organizations on their individual contribution.