One of the greater criticisms noted in the field of marriage and family therapy (MFT) research is the lack of clear and concise definitions, concepts, and treatment protocols. Given this, the field of MFT would benefit from research methodology to assist in the understanding of areas of previous confusion or dissension. This paper argues for the application of Delphi studies to serve this occasion. A description of the methodology of the Delphi and a discussion of Delphi studies implemented in MFT research literature are presented. Recommendations for the use of the Delphi in the field of MFT are highlighted.One of the greatest criticisms noted in the field of marriage and family therapy (MFT) research is the lack of clear and concise definitions, concepts, and treatment protocols. Pinsof and Wynne (1995) provided an overview, conclusions, and recommendations for the efficacy of MFT research and practice. They concluded that many studies failed to clearly define the problem under investigation. Researchers tended to equate constructs such as marital conflict and marital distress, whereas others considered these as two distinct constructs. Furthermore, little agreement between diagnostic classifications, such as between drug abuse and drug addiction, were noted.The struggles with evaluating the treatment of MFT was another concern noted by Pinsof and Wynne (1995). The problem is identified when looking at therapy "through the lens of the therapeutic approach under investigation and missing critical processes that influence outcome but do not fall with the purview of the approach's theory of the limited categories of the adherence ratings" (p. 606). Although MFT was found to be more beneficial and cost-effective than standard or individual treatments for some problems,