In the context of Earth Observation missions the development of end-to-end simulators (E2ES) has proven to be a useful tool to assess the mission performance and support the consolidation of the technical requirements and conceptual design, as well as to allow end-users assessing the fulfillment of requirements by the mission. For Space Science missions the development of performance simulators is not as extended, and it is usually done externally to the Agency, directly by the scientific community, and mostly for independent instrument chains