Which type of program uses a psychosocial, experiential learning process that relies on positive peer pressure within a highly structured social environment?

The correct answer is therapeutic communities.

Therapeutic communities refer to a type of program used in rehabilitation centers or groups for addicts such as Alcoholics Anonymous or Overeaters Anonymous. Through therapeutic communities, individuals get an opportunity to hear about success stories and experiences of their peers, which serves as positive peer pressure for them to improve their behavior and obtain success in overcoming an addiction or improving their conduct. 

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