According to the pmbok guide the wbs is a

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normax

Work Breakdown Structure and Network Diagram

According to the PMBOK Guide, "the WBS is 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." In other words, it lists the project's tasks, the subtasks, the sub-subtasks, and so on.
For this phase, you will create a work breakdown structure (WBS) for the project you selected during phase one. Remember that the WBS starts with your major deliverables (that you stated in your scope management plan) at the highest level. The lower levels have the tasks required to complete those deliverables. You should have at least three tasks under each deliverable, but you may have as many tasks as needed to ensure that the deliverables are complete. Review the textbook (and the PMBOK® Guide, if you have it) for some suggestions on how best to create a WBS. From your work breakdown structure, develop a project task list with dependencies, add durations, and then submit a network diagram (using MS Project) and a project schedule.

Develop the Work Breakdown Structure

• Your WBS should have a minimum of 25-30 tasks and be three subtasks deep.
• Make sure to use verb-object task names (for example, "Develop software").

1. Enter tasks in MS Project.
2. Create the predecessor relationships to create a network diagram.
3. DO NOT LINK SUMMARY TASKS!
4. In the Gantt Chart Tools tab, check the box marked Outline Number in the Show/Hide