In 2001, Bruce Wampold of the University of Wisconsin published the book The Great Psychotherapy Debate.[31] In it Wampold, a former statistician who went on to train as a counseling psychologist, reported that
- psychotherapy is indeed effective,
- the type of treatment is not a factor,
- the theoretical bases of the techniques used, and the strictness of adherence to those techniques are both not factors,
- the therapist's strength of belief in the efficacy of the technique is a factor,
- the personality of the therapist is a significant factor,
- the alliance between the patient(s) and the therapist (meaning affectionate and trusting feelings toward the therapist, motivation and collaboration of the client, and empathic response of the therapist) is a keyfactor.
Wampold therefore concludes that "we do not know why psychotherapy works".
http://en.wikipedia.org/wiki/Psychotherapy#Criticisms_and_questions_regarding_effectiveness
http://www.education.wisc.edu/cp/faculty/book.asp
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