The PMO charter is the organizational mandate for the PMO to exist.
A charter defines the role, purpose and functions of the PMO. It articulates who the PMO's sponsors and customers are, the services that it offers, and the staffing and support structures required to deliver those services.
PDCA cycle (Deming wheel)
The PDCA Cycle (Plan, Do, Check, Act), commonly known as the Demming wheel, is a well known model for CPI, or continual process improvement.
Read more: PDCA cycle