Abstract
A review is made of substantive publications reporting adverse effects of sensitivity training. Such reports lack any clear consensus as to what is an adverse effect. Some are based on small samples and almost all lack adequate controls. It is concluded: (a) that adverse effects do occur among a small proportion of trainees, (b) chat this proportion differs markedly in different populations, and (c) that no study yet published provides a basis for concluding that adverse effects arising from sensitivity training are any more frequent than adverse effects arising in equivalent populations not in groups. A method of casualty detection derived from a study by Yalom and Lieberman was used by the author in two residential laboratories, but no casualties were detected by it.

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