This Compendium is the first of three Deliverables of the Change and Transition Work Package of the EUROCONTROL SENSE Programme. The Compendium is part of the Proactive Method (ProACT Method) for the Management of Change in Civil Aviation. The ProACT Method consists of Information Material for Managers, a Users Manual and this Compendium. The selected material in this Compendium can be used by anybody in civil aviation who is tasked with planning and implementing changes in their organisation and/or in the ATM operational environment. The document gives the information that is necessary to make an informed choice of methods or tools that best fit the specific needs or purposes in a given change process. The information is compiled in standard templates and gives the relevant content and details on the quality and the practical attributes of the selected material.