David A. Winter is Professor of Clinical Psychology and Programme Director of the Doctorate in Clinical Psychology at the University of Hertfordshire, UK. He has applied personal construct psychology in clinical practice and research for 40 years, with over 150 publications including Personal Construct Psychology in Clinical Practice (1994) and Personal Construct Psychotherapy: Advances in Theory, Practice and Research (Wiley, 2005). Nick Reed is Director of the Centre for Personal Construct Psychology in the Department of Psychology and Sports Science, University of Hertfordshire, UK. He has taught and practiced personal construct psychology for over 15 years and has experience of applying PCP in diverse contexts, including organizational change, environmental consultancy, teacher effectiveness, and the training of junior doctors.