Work Breakdown Structure (WBS) is an outline for the project scope of work, and a hierarchical scope of work division of project, and provides a structure for organizing the schedule and cost data for analysing, tracking, and reporting purposes. The WBS is a task oriented, detailed breakdown that defines the code structure for tasks, and is a key project deliverable that organizes the team work with the elements of scope, responsibility, schedule and cost covering the entire project scope of work into manageable sections. (e.g. Units, Systems, Disciplines, Deliverables, etc.). The WBS initiates a work activity (deliverables) responsibility matrix, the Organizational Breakdown Structure (OBS) initiate a team organisation (resources) base responsibility matrix, and a resource based Cost Breakdown Structure (CBS) that costs are allocated to the lowest level of the WBS.
Cost Breakdown Structure (CBS) is cost allocation to the lowest level of the Work Breakdown Structure (WBS). The CBS is a breakdown of the costs of the various components of the structure including all work done by the subcontractors, and serves as a basis for subsequent monthly pay requests by the contractor. The CBS is used to continuously compare costs as they actually occur with the budget, and the case of a firm that has an integrated cost control system.
Organization Breakdown Structure (OBS) is a decomposition of necessary resources to perform job, is to identify and organise the resources responsible with carrying out activities associated with the project.
To be developed continuously...including template and standard formats