(1). Work Breakdown Structure (WBS)
The work breakdown structure is a deliverable-oriented grouping of project elements, which summarizes and defines the entire work scope of the project. Each descending level represents a more detailed definition of the project work. Work Breakdown Structure is the process of progressively layering project deliverables and project work into smaller, more manageable project units that organize and define the overall project scope. The lowest-level elements of the WBS (work packages) can be assessed, scheduled, and tracked.
(2). Resource Breakdown Structure (RBS)
Resource breakdown structure is a resource hierarchical structure divided according to the type and form of resources. It is a kind of project breakdown structure. The aggregated approach aggregates resource requirements and resource availability to a higher layer.
(3). Organizational breakdown structure (OBS)
graphically describes the roles and relationships in the team in project management. OBS is an organizational breakdown structure that looks similar to WBS, but instead of decomposing according to project deliverables, it decomposes according to the organization's departments, units, and teams. Project activities and work packages are listed under each department. In this way, an operations department such as IT or procurement can see all the things to do by looking at their own part of the OBS.
(4). Risk Breakdown Structure (RBS)
Risk Breakdown Structure is a hierarchical structure that describes the identified risks according to risk categories, and lists the risk categories and risk sub-categories that may occur in a typical project. Through the risk breakdown structure, the risk identification personnel can be reminded that there are various reasons for the occurrence of risks.
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