The article describes an "est" training, and discusses the literature on the testimony of "est" graduates. It notes minor changes on psychological tests after the training and mentions anecdotal reports of psychiatric casualties among est trainees. The article considers how est compares to more standard psychotherapy techniques such as behavior therapy, group and existential psychotherapy before concluding with a call for "objective and rigorous research" and stating that unknown variables might have accounted for some of the positive accounts. Psychologists advised borderline or psychotic patients not to participate.