Clarifies concepts of linearity and circularity as applied to marital and family therapy. Defines distinct and theoretically legitimate meanings of linearity (proportionality, unilaterality, temporality). Redefines circularity into two distinct meanings (recursivity and holicity). Concludes with call for continued deconstruction of social systems concepts as means toward refinement of systemic paradigm or as means toward development of new paradigm. (Author/NB)