Robert K. Yin is President of COSMOS Corporation, an applied research and social science firm. Over the years, COSMOS has successfully completed hundreds of projects for federal agencies, state and local agencies, and private foundations, and most of this book s applications come from these projects.Outside of COSMOS, Dr. Yin has assisted numerous other research groups, helping to train their field teams or to design research studies. A recent engagement has been with the United Nations Development Programme, and another assignment has been to provide guidance to assist doctoral students at th...