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We motivate the cosmological science case of measuring Type Ia supernovaewith the Nancy Grace Roman Space Telescope as part of the High Latitude TimeDomain Survey. We discuss previously stated requirements for the science, and abaseline survey strategy. We discuss the various areas that must still beoptimized and point to the other white papers that consider these topics indetail. Overall, the baseline case should enable an exquisite measurement ofdark energy using SNe Ia from z=0.1 to z>2, and further optimization shouldonly strengthen this once-in-a-generation experiment.

Roman CCS White Paper: Measuring Type Ia Supernovae Discovered in the Roman High Latitude Time Domain Survey