The WBS must be the basis for a project cost estimate if you plan to create a cost baseline and use earned value management as part of monitoring and controlling costs.
A project is visually, hierarchically, and deliverable-focused disassembled using a work breakdown structure (WBS). It is a useful diagram for project managers since it enables them to deconstruct the scope of their projects and see all the tasks necessary to finish them.
The work breakdown structure chart is a crucial project planning tool because it lists every phase of a project's work. The WBS levels below the project scope represent the activities, deliverables, and work packages required to complete the project from beginning to end. The final project deliverable, along with the tasks and work packages connected with it, lies on top of the WBS diagram.
Thus, WBS is an essential basis for a project cost estimate.
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