There have been two extensive reviews of P.E.T. course evaluation studies. The first, by Ronald Levant of Boston University, reviewed 23 different studies. The author concluded that many of the studies had methodological discrepancies. Nevertheless, out of a total of 149 comparisons between P.E.T. and control groups or alternative programs, 32% favored P.E.T., 11% favored the alternative group, and 57% found no significant differences. Levant did find three studies that met the standards of methodological adequacy. In these studies, out of 35 comparisons, 69% favored P.E.T. over the control group, none (0%) favored the control group, and 31% showed no significant differences. Levant concluded that P.E.T. appears to result in positive changes in parent attitudes and behavior and changes in children’s self-concept and behavior.
Robert Cedar of Boston University later reviewed 26 of the best designed research studies of P.E.T., using the “meta-analytic technique” of integrating the statistical findings from all the studies.For more details about this study, read the rest of this article by following the link here: