Developing and Delivering Practice-based Evidence promotes a range of methodological approaches to complement traditional evidence-based practice in the field of psychological therapies. * Represents the first UK text to offer a coherent and programmatic approach to expand traditional trials methodology in the field of psychological therapies by utilizing evidence gained by practitioners * Includes contributions from UK and US scientist-practitioners who are leaders in their field* Features content appropriate for practitioners working alone, in groups, and for psychological therapy services