In this collection, international contributors come together to discuss how qualitative and quantitative methods can be used in psychotherapy research. The book considers advantages and disadvantages of each approach as well as a recognition of how each method can enhance our understanding of psychotherapy.

Quantitative and Qualitative Methods for Psychotherapy Research: Introduction Wolfgang Lutz and Sarah Knox Part 1: Quantitative Methods Developing New and Improving Existing Measures Questioning the Measurement Precision of Psychotherapy Research Ann Doucette and Abraham W. Wolf. Multitrait-Multimethod Analysis in Psychotherapy Research: New Methodological Approaches Michael Eid, Christian Geiser and Fridtjof Wilhelm Nussbeck. Generalizability Theory in Psychotherapy Research: The Impact of Multiple Sources of Variance on the Dependability of Psychotherapy Process Ratings Rachel H. Wasserman, Kenneth N. Levy and Eric G. Loken. Using Functional Magnetic Resonance Imaging in Psychotherapy Research: A Brief Introduction to Concepts, Methods, and Task Selection Madeline M. Carrig, Gregory G. Kolden and Timothy J. Strauman Identifying and Analyzing Change in Psychotherapy Understanding How and Why Psychotherapy Leads to Change Alan E. Kazdin. Multilevel Modeling of Longitudinal Data for Psychotherapy Researchers: I. The Basics Giorgio A. Tasca and Robert Gallop. Multilevel Modeling of Longitudinal Data for Psychotherapy Researchers: II. The Complexities Robert Gallop and Giorgio A. Tasca. Three-Level Multilevel Growth Models for Nested Change Data: A Guide for Group Treatment Researchers Giorgio A. Tasca, Vanessa Illing, Anthony S. Joyce and John S. Ogrodniczuk. Multiple Levels of Analysis in Psychotherapy Research David A. Kenny and William T. Hoyt. Modeling Psychotherapy Process by Time-Series Panel Analysis (TSPA) Wolfgang Tschacher and Fabian Ramseyer. Using Clinical Significance in Psychotherapy Outcome Research: The Need for a Common Procedure and Validity Data Michael J. Lambert and Benjamin M. Ogles. Methodological Background of Decision Rules and Feedback Tools for Outcomes Management in Psychotherapy Wolfgang Lutz, Niklaus Stulz, Zoran Martinovich, Scott Leon and Stephen M. Saunders Aggregating Research Findings An Introduction to Meta-Analysis for Psychotherapy Outcome Research Arjan Berkeljon and Scott A. Baldwin. A Primer on Meta-Analysis of Correlation Coefficients: The Relationship Between Patient-Reported Therapeutic Alliance and Adult Attachment Marc J. Diener, Mark J. Hilsenroth, Joel Weinberger and Joel M. Monroe Part 2: Qualitative Methods Methodological Developments in Qualitative Research Developments in Task Analysis: New Methods to Study Change Antonio Pascual?Leone, Leslie S. Greenberg and Juan Pascual?Leone. An Adjudicated Hermeneutic Single-Case Efficacy Design Study of Experiential Therapy for Panic/Phobia Robert Elliott, Rhea Partyka, John Wagner, Rebecca Alperin, Robert Dobrenski, Stanley B. Messer, Jeanne C. Watson and Louis G. Castonguay. Creative Consensus on Interpretations of Qualitative Data: The Ward Method Ladislav Timulak. Meta-Analysis of Qualitative Studies: A Tool for Reviewing Qualitative Research Findings in Psychotherapy Methodological Issues in Qualitative Research From Single-Case Studies to Practice-Based Knowledge: Aggregating and Synthesizing Case Studies Shigeru Iwakabe and Nicola Gazzola. Qualitative Research Interviews Sarah Knox and Alan W. Burkard. Achieving Trustworthiness in Qualitative Research: A Pan-Paradigmatic Perspective Elizabeth Nutt Williams and Susan L. Morrow. Bracketing in Qualitative Research: Conceptual and Practical Matters Constance T. Fischer Part III Overview and Integration Sarah Knox and Wolfgang Lutz

Wolfgang Lutz is Full Professor and Chair of Clinical Psychology and Psychotherapy at the Department of Psychology as well as Director of the Clinical Training Program and the Outpatient Research Clinic at the University of Trier, Germany. He is Editor of Psychotherapy Research and on the editorial board of several journals in the field, such as Cognitive Therapy and Research. He has published widely on outcome management in psychotherapy, therapist effects and the prediction of treatment progress for individual patients.

Sarah Knox is Professor and Director of Training for the Counseling Psychology Ph.D. program in the College of Education at Marquette University, Milwaukee, USA. She is Co-Editor-in-Chief for Counselling Psychology Quarterly, and has served on the editorial board of several journals. She also publishes extensively on the psychotherapy process, as well as on training and supervision.