The field of psychotherapy is filled with theories, from theories of personality to those of psychopathology, psychodynamic theories to cognitive and humanistic theories. Based on the philosophy of science, this volume introduces different models as alternatives to theories of psychotherapy. While models are common in other fields, they are essentially unknown in psychotherapeutic practice and research. This revolutionary volume introduces a new era, and a change in thinking by comparing different models with theories, and by showing their respective strengths and weaknesses, the ways in which models are superior to theories, by highlighting the preferential features of models over theories, and by showing how the paradigm-shift to models can have powerful implications for the whole field of psychotherapy. This brief volume is for everyone who can be affected by this revolutionary shift, including practitioners of almost every approach, working with almost every clientele. Students and teachers of psychotherapy, and to all those interested in psychology, psychiatry, nursing, rehabilitation, and counselling will find this book gives a new and refreshing look at approaches to psychotherapy.