The PMO, the Project Management Office. The team within an organization which is responsible for delivering projects. Imagine the responsibility and burden on the PMO leader. From my experience running several PMOs it goes a little like this.... You are in charge of delivering the most critical, strategic projects for the organization and you need to do it with limited resources and limited organizational span of control.
I've also found through working with many clients and talking with peers, that starting or improving a PMO should be done by simplifying the approach. Simplify to get early wins, and then start to expand influence within your organization as you build trust through successful delivery.
Our approach follows the P - M - O process;