" Based on theoretical analysis, clinical observations, and some research findings (e.g., Kluft & Fine, 1993; Nijenhuis, Van der Hart, & Steele, 2002; Putnam, 1997; Reinders et al., 2003, submitted; Steinberg, 1995), as well as on 19th and early 20th century literature on dissociation (cf., Van der Hart & Dorahy, in press), we propose that traumatization essentially involves a degree of dissociative division of the personality that likely occurs along the lines of innate action systems of daily life and defense— what has been called structural dissociation of the personality (e.g., Nijenhuis et al., 2002; Van der Hart, Nijenhuis, Steele, & Brown, 2004). Dissociation of the personality develops when children or adults are exposed to potentially traumatizing events, and when their integrative capacity is insufficient to (fully) integrate these experiences within the confines of a relatively coherent personality. "

― Onno van der Hart