Each PMO function within the PMO Value Ring has four maturity levels. These maturity levels represent the degree of sophistication and capability with which the PMO can execute a particular function. The maturity model helps organizations assess their current capabilities and provides a structured approach to improve the effectiveness of PMO functions as they progress through different levels of maturity.

The evolution of PMO maturity is not necessarily linked to the number of functions it performs, but rather to how sophisticated and aligned these functions are with the organization's strategic, tactical, and operational needs. A mature PMO moves beyond basic operational tasks, adopting strategic roles such as portfolio management and governance. This shift helps ensure that the PMO contributes effectively to achieving broader organizational goals, adding value through well-implemented processes.