[1] Rosenzweig, who, with a co-author, has been credited with being the first to attempt to "elicit repression" in a laboratory setting, became well known after publishing a paper discussing "common factors" underlying competing approaches to psychotherapy.
With G. Mason, Rosenzweig criticized H. Meltzer's survey of studies of repression in an article published in the British Journal of Psychology.
Rosenzweig and Mason argued that the studies reviewed by Meltzer worked with sensory stimuli unrelated to the theory of repression, and "failed to develop under laboratory control the experiences which are subsequently to be tested for recall."
Donald W. MacKinnon and William F. Dukes credit Rosenzweig and Mason with being "the first to make an explicit attempt to elicit repression under conditions of laboratory control and observation."
He argued that all models of therapy could be equally successful, due to competent therapists sharing common factors that aided their patients.