In this seminal book on the construction of case studies in the field of language and literacy, the authors consider in detail what it means to be "on the case." They evaluate the basic assumptions that ground a qualitative approach to case study methodology, the decisions entailed in designing a case study, and the possibilities and challenges of data collection and analysis. For the novice researcher, this book is an essential manual on how to design and carry out a case study. For the experienced researcher, this book offers fresh insights into the theoretical issues that underpin qualitative case study research.