[en] The Mirror Advanced Reactor Study (MARS) is being performed by a team lead by Lawrence Livermore National Laboratory and includes TRW, The University of Wisconsin, General Dynamics Convair, Ebasco Services, Science Applications, the Energy Technology Engineering Center, and Grumman Aerospace. The roles of the team members are shown. The principal objectives of the MARS design are an economically and environmentally attractive tandem mirror reactor with efficient electricity production as the primary product. High temperature process heat for production of synthetic fuels is a secondary product. The reactor design emphasizes the many advantages of the tandem mirror for producing commercial power through fusion. Thus, MARS will serve as a strategic goal for the Mirror Fusion Program by establishing physics and technology requirements