People started developing simplified English in the 1970s. People continue developing simplified English today. AECMA is the "European Association of Aerospace Manufacturers". AECMA began work on simplified English. ASD is the "AeroSpace and Defence Industries Association of Europe". ASD has a Maintenance Group called STEMG that continues work on simplified English. STEMG is the "Simplified Technical English Maintenance Group". STEMG maintains the ASD-STE100, the latest simplified English.