Languages of Science and the Problem of Applied Clinical Knowledge: A Mixed Methods Appraisal of Eells' Case Formulation Research


  • David J.A. Edwards Department of Psychology, Rhodes University



psychotherapy case formulation, mixed methods research, therapist responsiveness, positivist vs. interpretive methods, quantitative vs. qualitative methods, case studies


This article is a methodological commentary on Eells’ (2010) summary of his research on case formulation.  It draws attention to an epistemological tension between a positivist and a qualitative/hermeneutic paradigm.  I argue that the kinds of questions researchers are most concerned with in the field of case formulation are ones with direct relevance for practice and that an exclusively positivist paradigm is problematically suited to answer these, an observation that emerges from a consideration of Eells account of his research.  While Eells’ account of his case-based strategy is initially positivist in intent, the introduction of a hermeneutic approach opens the field up considerably.  I conclude (a) that a "mixed methods" paradigm, which integratively and rigorously combines quantitative and qualitative methods and which has recently been called a "third research paradigm," offers a particularly attractive epistemological framework for planning research on case formulation that can directly guide and improve practice; and, following from this point, (b) that the meaning and direction of  Eells' research can be enhanced by explicitly conceptualizing it within such a mixed methods paradigm.


Author Biography

David J.A. Edwards, Department of Psychology, Rhodes University

Dan Fishman, Ph.D. Editor-in-Chief, Pragmatic Case Studies in Psychotherapy Professor of Clinical and Organizational Psychology Graduate School of Applied and Professional Psychology Rutgers University Mailing address: 57 Jaffray Court Irvington, NY 10533 914-693-8549 fax: 603-917-2567 email:




How to Cite

Edwards, D. J. (2010). Languages of Science and the Problem of Applied Clinical Knowledge: A Mixed Methods Appraisal of Eells’ Case Formulation Research. Pragmatic Case Studies in Psychotherapy, 6(4).



Commentaries on Original Articles