IUPsyS recognizes 66 national psychology associations and at least 15 others exist. The American Psychological Association is the oldest and largest. Its membership has increased from 5,000 in 1945 to 100,000 in the present day.C. James Goodwin, "United States", in Baker (ed.), Oxford Handbook of the History of Psychology (2012). The APA includes 54 divisions, which since 1960 have steadily proliferated to include more specialties. Some of these divisions, such as the Society for the Psychological Study of Social Issues and the American Psychology–Law Society, began as autonomous groups.
IUPsyS recognizes 66 nati.onal psychology associations and at least 15 others exist. The American Psychological Association is the oldest and largest Its membership has increased from 5,000 in 1945 to 100,000 in the present day.C. James Goodwin, "United States", in Baker (ed.), Oxford Handbook of the History of Psychology (2012). The APA includes 54 divisions, which since 1960 have steadily proliferated to include more specialties. Some of these divisions, such as the Society for the Psychological Study of Social Issues and the American Psychology–Law Society, began as autonomous groups.