The mlcronewton thrust range capabilities or Field Emission Electric Propulsion have recently received considerable attention, In view ofthe application potential or this type of thrusters In high performance disturbance compensation systems. Various planned scientific missions would greatly benefit from the use or FEEP-based drag-free controllers, under both the mass saving and the performance improvement standpoints; among them, the proposed ESA-NASA project SAGITTARIUS acknowledges FEEP as a key mission-enabling technology. This paper highlights the potential advantages or the use or FEEP as compared to conventional cold gas thrusters and reviews the development status or FEEP subsystems. To Illustrate these advantages, the FEEP system configuration, as well as system, subsystem and Interface requirements are analyzed In the paper for the SAGITTARIUS case.