Some commonly used terms used with WBS project management include: The deliverable orientation of the hierarchy includes both internal and external deliverables.” The WBS is decomposed into work packages. Each descending level represents an increasingly detailed definition of the project work. It organizes and defines the total scope of the project. The Project Management Institute’s PMBOK® Guide-Third Edition defines WBS as “a deliverable-oriented hierarchical decomposition of the work to be executed by the project team to accomplish the project objectives and create the required deliverables.
