 The Earth and Mission Science Division (MSD) supports the preparation, development and operations of research and operational missions within the Earth Observation Programmes Directorate.The Division is responsible for ensuring the application of scientific and other user community requirements in all phases of the development of Earth Observation missions, from precursor studies through to in-orbit satellite operations, and for ensuring coherence throughout with the objectives expressed in the mission requirements documents, including the management of mission-, instrument-specific, or ad-hoc advisory structures (as required).The Division organises and supports the activities of the Advisory Committee for Earth Observation (ACEO), including management and implementation of the scientific selection procedure for ESA research missions.