Psychodynamic couple therapy is based on psychoanalytic theory and focuses on interpreting defenses and anxieties to foster change. The therapist aims to join with the couple at an unconscious level to provide emotional containment and interpret anxieties that previously overwhelmed them. Key theories underlying psychodynamic couple therapy include Fairbairn's model of psychic structures, Klein's theory of projective identification, and Winnicott's theory of the parent-infant relationship, which all view relationships and unconscious processes as central to understanding couples.