major diversities emerged in response to their conceptualizations regarding the relationship between Narcissistic and Borderline personalities, normal vs. pathological narcissism, their ideas about narcissistic idealization and the grandiose self, as well as the psychoanalytic technique and the narcissistic transference. Theory on narcissism According to Kernberg, the self is an intrapsychic structure consisting of multiple self representations. It is a realistic self which integrates both good and bad self-images. That is, the self constitutes a structure that combines libidinally and aggressively invested components. Kernberg defines normal narcissism as the libidinal investment of the self. However, it needs to be emphasized that this libidinal investment of the self is not merely derived from an instinctual source of libidinal energy. On the contrary, it stems from the several relationships between the self and other intrapsychic structures, such as the ego the superego and the id. Types of narcissism Normal adult narcissism This is a normal self-esteem based on normal structures of the self. The individual has introjected whole representations of objects, has stable objects relationships and a solid moral system. The superego is fully developed and individualized. Normal infantile narcissism Regulation of self-esteem occurs through gratifications related to the age, which include or imply a normal infantile system of values, demands or prohibitions. Pathological narcissism Three subtypes Regression to the regulation of infantile self-esteem. The ideal ego is dominated by infantile pursuits, values and prohibitions. The regulation of self-esteem is overly dependent on expressions or defences against infantile pleasures, which are discarded in adult life. This is the mildest type of narcissistic pathology. Narcissistic choice of object. This type is more severe than the first one but more rare. The representation of the infantile self is projected on an object and then identified through that same object. Thus, a libidinal association is generated, where the functions of the self and the object have been exchanged. Narcissistic personality disorder. This type is different from both normal adult narcissism and from regression to normal infantile narcissism. It is the most severe type and is suitable for psychoanalysis. In Kernberg's view, narcissistic personalities are differentiated from both normal adult narcissism and from fixation at or regression to normal infantile narcissism. Fixation at a primitive stage of development or lack of development of specific intrapsychic structures is not adequate to explain the characteristics of narcissistic personalities. Those characteristics (through a process of pathological differentiation and integration of