This book provides students and seasoned researchers alike with an accessible introduction to secondary analysis. Part I provides psychologists with a set of accessible methodological primers including chapters on using short forms of scales; analyzing survey data with complex sampling designs; and dealing with missing data. Chapters in Part II provide compelling examples of secondary data analysis in various kinds of psychological research including development and aging, behavioral genetics, cross-cultural psychology, and the psychology of political affiliation. This wide-ranging yet practical book shows how the analysis of secondary data can provide unique and compelling opportunities for advancing psychological science.