This guide is part of a series of Virtual Training to Advance Revenue Administration (VITARA) reference guides that has been developed based on the contents of the VITARA online modules. This reference guide focuses on tax administration reform programs. It explains why reforms are important for tax administrations, and how a tax administration can successfully plan and manage the reform process. It also details who should be involved in a reform, and what management and governance arrangements are needed to ensure reforms are delivered on time, within budget, and of acceptable quality. The guide provides practical guidance to project managers on how to prepare and execute a project plan, outlining the five key phases of a project and the planning documentation required. The guide succinctly presents proven management practices applied by tax administrations across the world in managing their reform programs.