This book shows how data collected from more than 1000 participants during the past sixty years have been analyzed to test a wide range of hypotheses, and describes how the findings have led to the development of improved research methods. Topics covered include the management and analysis of data, prenatal, familial and genetic studies, physical growth, development and maturation, bones and teeth, body composition, and risk factors for cardiovascular disease. With more than 1000 specialized publications of Fels data to date, the present book provides a unique overview of this fascinating research program.