This is the first methods handbook specifically designed to meet the needs of those studying development. Leading developmental methodologists present cutting-edge analytic tools and describe how and when to use them in accessible, nontechnical language. They also provide valuable guidance for strengthening developmental research with designs that anticipate potential sources of bias. Sections typically begin with an overview chapter on foundational issues. Subsequent chapters delve into specific techniques, following a consistent format that encompasses basic issues, conceptual principles and statistical assumptions, recent technical advances, developmental applications, and future directions. Research examples demonstrate the procedures in action and give readers a better understanding of how to match research questions to developmental methods. The companion website supplies data and program syntax files for many of the chapter examples.