Fundamentals of the Theory of Borderline Disorders: Green addresses the so-called borderline cases from a psychoanalytic perspective, situated at the intersection of neurosis, psychosis, depression, and perversion. The development of psychoanalytic theory from Freud to the present is examined, focusing on how to engage with this challenging patient group, whose transference can be either completely cold and rejecting or excessively heated, bordering on psychotic transference. In this book, Green explores the boundaries and transitions between the somatic and the psychic, the internal and the external, the self and the other, referencing Winnicott, Bion, and Rosenfeld, while clearly distinguishing his views from those of Lacan. He moves away from Freud's neurosis model and places borderline cases, which today constitute the majority of patients in some analytic practices, at the center of his discussion.