This book is concerned with the utility of single-case evaluation in social work, and the experience of applying this methodology in practice. Its main purpose is to demonstrate the viability of single-case designs as a research method in addressing particular questions of evaluation in social work practice. This is achieved mainly through examples of studies involving extensive use of this methodology in British social work. Against a background in which more is written about single-case designs than its actual use in practice, this text concentrates on the application of this methodology to practice and the approaches that have been used to successfully encourage social work practitioners to use single-case designs.