While the debate on the spiritual aspect of recovery continues, the treatment community has widely accepted the recovery model developed by Alcoholics Anonymous in the 1930s. Based on the admission that the addict or alcoholic is in rehab because he or she has clearly not been able to manage life successfully, this model encourages reliance on a "higher power" something outside themselves that is greater than they are. While some people in recovery join a religion or increase participation in one, AA strongly emphasizes that it is not allied with any denomination; each treatment center chooses its own approach to this question and most try to accommodate a wide variety of beliefs. Generally, though, treatment professionals use the spiritual model because, in many cases deemed "untreatable," it has been shown to work.