 SDGs originate with proposals from members on topics in art, biology, economics, history, literature, movies, music, political science, psychology, science, or technology.Each proposal is ranked by members, gets worked out in detail by a member who agrees to be its "coordinator", and then becomes available for members to select as their next term's SDG.The PLATO Society offers a program of eight Colloquia each year, which are major lectures at which important scholars, journalists, public officials, and other professionals give formal presentations on matters of general interest.