This document discusses the logical progression of a Project Management Office's (PMO) level of maturity as an organization's maturity level increases. It outlines five levels of a PMO from basic to advanced that align with the five levels of the Capability Maturity Model Integration (CMMI) framework. At each increasing level, the PMO takes on more responsibilities such as standardized processes, project information management, quantitative process management, and enterprise-wide continuous improvement. Relating the PMO level to the organization's maturity helps ensure the PMO evolves appropriately to support the organization's capabilities.