A Cost Breakdown Structure (CBS) is a breakdown or hierarchical representation of the various costs in a project. The Cost Breakdown Structure represents the costs of the components in the Work Breakdown Structure (WBS). The CBS is a critical tool in managing and the financial aspects of any project and creates a structure for applying measurable cost controls.
The CBS allows you to define the exact level of details required to efficiently and effectively manage a given project or contract. In order to provide one cohesive construct with the necessary level of granularity, the CBS manages and tracks: