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While statements about the effectiveness of psychotherapy must be accurate yet generalized in a policy document format, research studies have not equitably investigated all factors that either enhance or diminish psychotherapy effectiveness. Full explication of the differential status of any given variable and the state of research of any given factor in the practice of psychotherapy is beyond the scope of this site.

The research citations that accompany each statement provide specificity of scope, limitations, and implications for psychotherapy practice and identify the therapeutic circumstances in which research has determined that psychotherapy is soundly effective. Examples of these important moderating variables include client/patient characteristics, clinician characteristics, context factors, diagnostic classification, severity, and developmental status.

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Theeboom, T.  Beersma, B. & .M. van Vianen , A., (2013): Does coaching work? A meta-analysis on the effects of coaching on individual level outcomes in an organizational context, The Journal of Positive Psychology: Dedicated to furthering research and promoting good practice, DOI: 10.1080/17439760.2013.837499.