BACKGROUND: The advantages of manualized psychological treatments include: the promotion of evidence-based practice, the enhancement of treatment integrity, the facilitation of staff training, and the potential replicability of treatment., ARGUMENT: The manualization of a multi-component, multidisciplinary treatment programme for male personality-disordered offenders is described. The background to this development is explained and the treatment setting is described briefly, followed by a description of the eight treatment manuals: (1) the treatment overview, (2) Psychoeducation focusing on personality disorder diagnosis and core beliefs, (3) Trust and Self-awareness group exercises, (4) Stop and Think! -- a social problem-solving intervention, (5) Controlling Angry Aggression, (6) Controlling Substance Use, (7) Criminal Thinking/Belief Therapy, and (8) Skills for Living -- a social skills manual., CONCLUSIONS: In addition to the original aims of manualization, this exercise has clarified the treatment programme, included less highly trained staff in the delivery of therapy and permitted the evaluation of treatment modules, thus contributing to the incremental evaluation of the overall programme. These manuals may usefully be shared with other practitioners in the field.