According to the PMBOK® Guide, deciding on the project life cycle and the phases that will make up that cycle is a fundamental task of Project Integration Management.
While phases naturally impact the schedule and the scope, the high-level decision regarding the " framework " of the project belongs to Integration because:
The Big Picture: Integration Management is responsible for the coordination of all other knowledge areas. Determining the life cycle (Predictive, Adaptive, or Hybrid) sets the stage for how all other processes (Scope, Schedule, Cost, etc.) will be managed.
Develop Project Management Plan: The selection of the project life cycle is a primary output of the tailoring process and is documented within the Project Management Plan. This plan is the central deliverable of the Integration Management knowledge area.
Phase Transitions: Integration Management involves managing the transition between phases (Phase Gates or Kill Points), ensuring that the project remains aligned with business objectives before moving from one phase to the next.
Analysis of other options:
A. Project Schedule Management: This area focuses on the specific timing of activities and milestones within the phases, but it does not define the overarching life cycle itself.
B. Project Scope Management: This area defines the work required to complete the project, but the phases represent the management structure around that work.
C. Project Resource Management: This area focuses on acquiring and managing the team and physical resources, which are utilized within the phases but do not define them.
Per PMI standards, the project manager acts as the primary integrator to ensure that the chosen Project Life Cycle is appropriate for the project ' s complexity, risk, and delivery requirements.
