Members self-select prospective members, and chapters cooperate on a wide variety of inter-Greek programming to support campus life. Once a student becomes a member of one of the traditional social and academic societies they may not join another from that conference due to 'anti-poaching' rules. However, members of the traditional social and academic fraternities, sororities and societies are often elected as members of "professional, honor and/or service" societies as they are chosen or earn the honor by grade, class rank or achievement. All but one of Stevens' Greek organizations are chapters of national fraternities or sororities, which in turn participate in several cooperative national associations, designated by one or more conference allegiances: the NIC (most social fraternities), the NPC (most social sororities), the "NPHC" (culturally African American), the NAPA (culturally Asian & Pacific Islander), the NALFO (culturally Latino/Latina), the NMGC (multicultural), the ACHS (most Honor Societies), or the PFA (Professional) associations.