Abstract
Laska, Gurman, and Wampold (2014, pp. 467-481) present their common factors (CF) model as an alternative/complement to existing empirically supported treatments. The CF model is largely based on nonrandomized studies and a post hoc interpretation of a lack of differences between psychotherapies in their outcomes. Our view is that the CF model would be advanced through randomized experiments that test the specific components that Laska et al. (2014) hypothesize as necessary and sufficient for change. With some notable exceptions, we agree with many of the points made by Laska et al. (2014) regarding the relevance of the CF perspective to the delivery of psychotherapy in general, but suggest that prospective studies that control for potential confounds are needed to successfully advance the CF model or any other model of psychotherapy.
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