This examination of crime and criminological theory takes a direct approach to a question that often confuses and frustrates students, why do people commit crimes? This volume begins with an overview of the key elements of the study of crime and criminology, including law, public policy, research literature and the philosophical origins of crime theories. These theories, based in biology, psychology, and sociology, are then broken down to their basic elements and causal processes in order to be explored. The authors examine the practical implications and applications each theory has on the administration of justice. In conclusion, the text looks at the future of crime theory by speculating whether or not new research designs, theories and paradigms are needed.