This introduces some major concerns and themes covered in the book. It is suggested assessment of antisocial personality should combine a nomothetic (trait-based) approach with an idiographic (person-centred) approach. The latter aims to capture, first, the particular motives, values and goals that drive the individual’s antisocial behaviour, and second, the feeling of continuity, coherence and sense of agency expressed in the individual’s life story. The reader is warned against an uncritical acceptance of ASPD as a ‘disorder’.