The thesis will be centred on the implementation of the Project Management Office in the Operations department of a small-sized IT Company through a Change Management Model. To begin, a literature review of the Project Management fundamentals and the Change Management approach will be presented. Simultaneously there will be an in depth discussion of the most widespread Change Management Models. Subsequently, out of an as-is analysis of the Operations department of the Organization, the observed criticalities will be addressed through a redesign of the main processes. The to-be scenario will include the Project Management Office among the actors and a new set of tools and software that endeavour to support each phase of the projects lifecycle.