This is a book about using secondary data in social and educational research. It assumes no prior mathematical expertise and is intended as a practical resource for researchers who are new to the field of secondary data analysis. The book comprises two parts. The first considers the role of secondary data analysis as a research method in contemporary social research, before introducing the reader to a range of raw and aggregate data sources, as well as practical strategies for locating and assessing potential datasets. Part two of the book introduces worked examples which show the potential for using secondary sources to answer a varied range of research questions. This section provides guidance on accessing, managing and preparing large datasets for analysis. Throughout the book, the aim is to encourage researchers to consider the potential for using secondary data both as their primary research method but also as a useful strategy in mixed methods designs.