Other projects provided complementary contributions, such as the Advanced Safe Separation Technologies and Algorithms[22](ASSTAR), which carried out performance, safety and cost-benefit analyses for ASAS applications, including a limited version of Self-separation, resulting in positive findings. Based on the above-mentioned and other studies, ASAS-based self-separation has been selected as one of the goals to be pursued by major development programs in air traffic management, such as Single European Sky ATM Research & Development (SESAR)[23][24] and the U.S. Next Generation Air Transportation System[25](NextGen), even if limited to certain conditions and airspaces.