These days, over 86% of companies claim to have a PMO (Project Management Officer), a true player in the company's transformation, a project coordinator and facilitator, even if their objectives and function are not always well understood, not to mention the thousands of start-ups springing up all over the world and in all sectors of activity. Despite this number, only 29% of companies complete their projects on time. Apart from the reasons given, these are often details that organizations overlook when setting up PMOs or in operation. In this book, the author presents : Firstly, the concept of "PMO", from its genesis: its emergence, through its function, the different types of PMO, its justification, composition and evaluation. Secondly, the toolbox: methods, techniques, artifacts, software, and over 300 Templates in digital formats for download. Thirdly, practical advice and guidance on how to successfully implement and operate a new PMO within an organization.