Key goals of NASA’s Evolvable Mars Campaign (EMC) include expanding the human presence on Mars by 2030 to promote scientific progress, innovation and international collaborations. This interest requires the development of new EDL technologies to carry heavy payloads and support human presence. It is essential to create multifunctional and reusable landers that include the Martian Ascent Module (MAV), minimizing its weight to meet the requirements of human missions. This thesis work aims at developing mission analysis techniques to complement the conceptual design of a human Mars lander with the capability to ascend and descend from Martian orbit. The proposed methodology deals with the sizing of the lander in its systems and subsystems, integrating it with a mission analysis to evaluate its performance.