The PMBOK 5th edition has 24 processes for the Planning Process Group. For the Knowledge Area of "Project Scope Management," we have the following:
- Plan Scope Management Process
- Collect Requirements
- Define Scope
- Create WBS
- Validate Scope
- Control Scope
Based on the online tutorial that I've read, it seems that "Plan Scope Management Process" contains the following:
- Collect Requirements
- Define Scope
- Create WBS
- Validate Scope
- Control Scope
Therefore, is it reasonable to view "Plan Scope Management Process" as the process containing the previous items as sub-processes? This seems clearer because "Plan Scope Management Process" appears dependent on these other things.