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This presentation aims to define a group of pathologies which one can designate as borderline. One finds in this group characteristics which separate these patients from the ordinary run of psychoneurotics. In this borderline group, the same psychoanalytic technique as in psychoneurotics is applicable except that, although attention to and treatment of the disturbed psychosexual impulses is included, there must be attention to and treatment of the disturbed narcissism as well. A great part of ego functioning is involved in the illness. This is one important feature in the borderline group that makes therapy more difficult, and the prognosis more grave, than in psychoneurotics.