THIS PROPOSAL IS RELEVANT TO SCIENCE OBJECTIVES AA AC AND AD OF THE INSIGHT MISSION AND IS AN INTERDISCIPLINARY INVESTIGATION (SPECIAL INVESTIGATION #8). TIDES ARE SENSITIVE TO CHARACTERISTICS (LIKE MANTLE TEMPERATURE AND GRAIN SIZE) WHICH ARE ONLY WEAKLY CONSTRAINED BY OTHER METHODS. THIS APPROACH IS THUS COMPLEMENTARY TO AND EXPANDS ON EXISTING INSIGHT OBJECTIVES. I PROPOSE TO COMBINED THE TIDAL OBSERVATIONS WITH OTHER CONSTRAINTS USING A MARKOV CHAIN MONTE CARLO APPROACH TO PROBE MARS'S INTERNAL STRUCTURE IN AN INTERDISCIPLINARY FASHION. THE RESULTS WILL ALSO BE USED IN A COMPARATIVE PLANETOLOGY APPROACH COMPARING THE MARS RESULTS WITH THE BETTER-CHARACTERIZED TIDAL RESPONSE OF THE SOLID EARTH AND THE MOON.