“…Consistent with basic psychoanalytic assumptions, for Blatt there is no neat distinction between -normal‖ and -abnormal‖ or disrupted personality development (Blatt, 2008;Blatt and Luyten, 2009;Blatt and Shichmann, 1983). His views also do not assume a neat distinction between normal variations in personality development, -symptom disorders‖, and -personality disorders.‖ As I will discuss in more detail later, mainstream psychology and psychiatry have rediscovered the validity of both of these latter assumptions, and Blatt's work in this context has had a profound influence, not least on the most recent formulations in DSM-5 (American Psychiatric Association, 2013;Luyten and Blatt, 2015;Skodol and Bender, 2009). Briefly, Blatt viewed personality development as proceeding through a continuous dialectic interaction between the capacities for interpersonal relatedness and self-definitionthat is, the capacity to establish and maintain, respectively, (a) reciprocal, meaningful, and personally satisfying interpersonal relationships, and (b) a coherent, realistic, differentiated, and essentially positive sense of self or an identity (see Figure 1).…”