In this chapter interventions addressing risk of sexual reoffending with people with personality disorder diagnoses will be explored. As there is very little evidence of any particular approach working with this group it is important to recognise that we are in the course of a developmental process, as opposed to presenting the 'definitive model' of treatment. Because of the heterogeneity and complexity in this population formulation based interventions need to be informed by a wide range of theoretical perspectives and are inevitably complex. The field is too young to arrive at a definitive model, and to do so, even if it were evidence based, would potentially represent premature closure. Practice needs to be an evolving process building on emerging evidence, clinical experience and critical reflection. (PsycINFO Database Record (c) 2019 APA, all rights reserved)