According to the PMBOKfrom PMI, Project Scope Management describes the processes required to ensure that the project includes all the work required, and only the work required, to complete the project successfully. It consists of initiation, scope planning, scope definition, scope verification, and scope change control.
The output of the scope definition process is the WBS. It’s clear that 3D WBS tools and techniques are perfect to define project scope. We dissociate scope of works that is clearly the 3D WBS, and scope of Product which is based on the PBS only.
3D WBS is in the core of project management and project performance.