Robert K. Yin is the president of COSMOS Corporation, an applied research and social science firm. He has also assisted in numerous other research groups and evaluation teams at the World Bank and the United Nations Development Programme. This book, in its 5thedition, focuses on case study research as a valuable research method. The book presents the breadth of case study research at a detailed practical level. It also features important case study design and analytical methodologies to help people doing case study research. The book consists of extensive chapters on preparation for research and data collection as a part of case study evidence and thoroughly runs through reports, conclusions and recommendations. The book also consists of examples of case studies done in different academic and professional fields. Several tutorials, located at the end of relevant chapters, serve as important tools for development of understanding of the areas discussed and help explore the complexity of topics.