There are many teachers who think about doing research in their own classes and schools but who are perplexed by what appears to be involved. This book is intended for these perplexed practitioners, to provide them with an easily understandable narrative about the concrete praxis of doing research in their classrooms or in those of their teacher peers teaching next door or in the same school. The fundamental idea underlying this book is to provide an easily accessible but nevertheless intellectually honest text that allows teachers to increase their agency with respect to better understanding their praxis and the events in their classrooms by means of research.The author draws on his experience of doing teacher-research while being a high school teacher and department head. Roth uses six concrete research studies that he has conducted alone or with peers to describe the salient parts of any teacher-researcher investigation including: what topic to study; issues of ethics and permissions from students, school, and parents; how and what sources to collect; how to structure resources; how to construct data from the materials; how to derive claims; and how to write a report/research study. Roth chose the case-based approach because cases provide the details necessary for understanding why and how he, as teacher-researcher, has made certain decisions, and what he would do differently today. Using this case-based approach, he allows readers to tie methods choices to situations that they likely are familiar with.