This thesis examined the relationship between key developmental variables, dynamic risk factors, and personality. First, a detailed review of the literature pertaining to these areas is presented. A narrative review with systematic search strategies was compiled due to the breath of the topic areas. Second, an empirical research project was conducted to investigate the relationship between key developmental variables, dynamic risk factors on the Stable-2007 (formally Stable-2000 and Sex Offender Needs Assessment Rating) (Hanson & Harris, 2001; Hanson, Harris, Scott, & Helmus, 2007), and personality disorders measured using the Million Multiaxial Clinical Inventory (MCMI-III) (Millon, Millon, Davis, & Grossman, 1997). The research had a secondary aim to evaluate whether any of the variables could be used to predict treatment attrition. The Challenge project data was utilised for this research which comprised information on 106 sex offenders both child molesters (n=69) and rapists (n=37). The research demonstrated number of relationships between personality disorder, key developmental variables, and the Stable-2007 items. There were very few significant associations between any of the variables and treatment attrition. Third, a case study aimed to demonstrate the practical utility of Stable 2007 discussed in Chapter 1 and researched in Chapter 2 is presented and relevant interventions are discussed. Fourth, a critique of a psychometric measure, the Stable-2007 is provided, which demonstrates continuing advances and validation of dynamic risk assessments. Finally, an overall discussion of each of the chapters is provided.