QUADRANGULAR THERAPY By N., Pam M.S. - April 28, 2013 The four people involved in quadrangular therapy for the couple and each partner's therapist. All four work together to work out problems in the primary relationship. QUADRANGULAR THERAPY: "Quadrangular therapy seemed to work best for the Smith's." Related Psychology Terms RELATIONSHIP THERAPY MULTIPLE MARITAL THERAPY DIRECTIVE PLAY THERAPY EMOTION-FOCUSED COUPLES THERAPY SELF-HELP GROUP COUPLES THERAPY TANDEM THERAPY DOMESTIC PARTNERSHIP MENAGE A TROIS TROILISM Cite this page: N., Pam M.S., "QUADRANGULAR THERAPY," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/quadrangular-therapy/ (accessed September 21, 2019).