During the Planning Process the Project Management Plan is developed. This process also identifies and defines the project scope and the project cost, and schedules the project activities that occur within the project.
The Project Manager develops the Project Management Plan that is subject to approval by the Project Sponsor
In this phase the Project Manager defines:
Scope
Work Breakdown Structure (WBS)
Costs
Quality
Resources
Communications
Risk
Procurement
Project Organization
The next step is to create or modify the Project Management Plan
If you use gedproEPM, this process is developed in Planning of a project with gedproEPM