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Psychotherapy, Effectiveness of

  1. Michael J. Lambert

Published Online: 30 JAN 2010

DOI: 10.1002/9780470479216.corpsy0757

Corsini Encyclopedia of Psychology

Corsini Encyclopedia of Psychology

How to Cite

Lambert, M. J. 2010. Psychotherapy, Effectiveness of. Corsini Encyclopedia of Psychology. 1–2.

Author Information

  1. Brigham Young University

Publication History

  1. Published Online: 30 JAN 2010


The effectiveness of psychotherapy has been the subject of study since the 1930s. The activities that characterize psychotherapy practice have evolved over time and today consist of hundreds of established procedures based on psychological theories aimed at reducing the symptoms of psychopathology. In this brief summary, some of the most notable findings are reviewed and their implications highlighted.


  • psychotherapy outcome;
  • negative effects;
  • efficiency of psychotherapy;
  • placebo effect;
  • outcomes management;
  • outcome measures;
  • psychoactive medication