This book is about the different philosophical paradigms and ideas that influence qualitative research. Its aim is to discuss and evaluate the ways that philosophical positions inform qualitative research as currently practiced. Unlike other contributions to the field, this book takes a historical perspective and shows how the philosophical ideas have evolved and influenced qualitative research in previous times and today. Today, qualitative researchers often report on their philosophical commitments (if they do so at all) in a separate section of their papers, but this book is written from the perspective that philosophical ideas influence everything in the research process from the first formulation of a research theme to the final reporting of the results. Therefore, it is preferable to highlight how this happens. Philosophy should thus not be thought of as a purely abstract discipline, disconnected from the practicalities of research, but rather as a concrete and pervasive aspect of all qualitative research practices. This book does not provide in-depth treatments of qualitative methods and techniques such as interviewing, document analysis, or participant observation, but rather aims to introduce and discuss the philosophical issues that are relevant regardless of the specific methods employed by qualitative researchers.