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This book reports an extensive study of 15,000 Minnesota high school students in order to determine the personality and environmental factors that appear to contribute to delinquency and high school dropout. The students were group tested with the Minnesota Multiphasic Personality Inventory (MMPI) when in the ninth grade. Microfilms were made of the school records; the students filled out a Personal Data Sheet; and their teachers predicted the students likely to have legal or emotional difficulties. Three years later, a student-by-student follow-up survey was made. Police and court files were searched for names and records. These were used in making a "delinquency rating" that was based on behavioral standards that would be applied similarly over all the state. It was recognized that standards of law enforcement might vary from community to community. Past school conduct and adjustment were also rated on the basis of teacher reports. Four thousand of