Recent empirical research has shown that children with sexual behavior problems and adolescents who offend sexually are diverse populations consisting of several subtypes (Hall, Mathews, & Pearce, 2002; Pithers, Gray, Busconi, & Houchens, 1998; Worling, 2001). This article reviews the descriptive and empirical research related to identifying subtypes of children with sexual behavior problems and adolescents who offend sexually. Examples of clinically and empirically derived typologies are presented. The author discusses how data from the empirically derived typologies can be incorporated within a multidimensional assessment framework based on the Trauma Outcome Process model (Burton, Rasmussen, Bradshaw, Christopherson, & Huke, 1998; Rasmussen, Burton, & Christopherson, 1992; Rasmussen, 1999, 2001, 2002). The application of this framework in assessing and treating children with sexual behavior problems and adolescents who offend sexually is described.