"The Inputs to the Create WBS process are:
.1 Project scope statement - The project scope statement describes, in detail, the project's deliverables and the work required to create those deliverables. The project scope statement also provides a common understanding of the project scope among project stakeholders.
.2 Requirements Documentation - Describes how individual project requirements met business needs. Start out at high level and become progressively more detailed as project continues.
.3 Organizational process assets - Examples:
Policies, procedures, and templates for the WBS,
Project files from previous projects, and
Lessons learned from previous projects.