PM as a Service, Management Services, PMO as a Service, PMOaaS, PMaaS. Project management services have many names and abbreviations. No matter the name, the essence is the same.
The RACI maps tasks and deliverables against roles on your project, and decision making and responsibilities are allocated to each role using the above terms.
The Software Development Life Cycle as a structured iterative process varies from company to company aiming at delivery of the best quality product that satisfies the needs even of the most demanding customers.