Basic ingredients or common factors in psychotherapy?

Discusses and evaluates some previous presentations concerning the essential and necessary conditions for positive change in psychotherapy, particularly H. R. Strupp's (see PA, Vol. 51:Issue 6) paper. The conception of essential conditions for change is compared with views concerning hypothesized common or nonspecific factors in psychotherapy, and some apparent similarities are delineated. (PsycINFO Database Record (c) 2010 APA, all rights reserved)