The second edition of this bestselling reference identifies the PMO as the essential business integrator of the people, processes, and tools that manage or influence project performance. It explains how the PMO applies professional project management practices and integrates business interests with project goals. This edition examines 20 function models that can be used to guide an organization through the deliberation and development of PMO operational capability. These models suggest what project management capability can be realized through comprehensive implementation of each PMO function.