<P>Michael R. Gottfredson and Travish Hirschi''s 1990 <EM>A General Theory of Crime</EM> is a classic text that helped reshape the discipline of criminology. It is also a testament to the powers of clear reasoning and interpretation. </P><P>In critical thinking terms, reasoning is all about presenting a solid and persuasive case - and as many people instinctively understand, the most persuasive reasoning is that which bases itself on a single, simple hook. In Gottfredson and Hirschi''s case, this hook was what has come to be known as the "self-control theory of crime" - the idea that the tendency to commit crime is directly related to an individual''s level of self-control. </P><P>While the dominant schools of thought of the time tended to focus on crime as the product of complex environmental factors, with little attempt to unify different theories, Gottfredson and Hirschi sought to interpret things so as to provide a single overarching concept that explained why crimes of all sorts w