Overall maturity of object relations as assessed by the McGill Object Relations Scale

The McGill Object Relations Scale (MORS) is an instrument for assessing levels of drive-based object relations along a continuum of positions representative of psychosexual development. Its theoretical foundations as well as empirical antecedents are presented, and its rating procedure is demonstrated through a case application. The MORS was applied, by five experienced psychiatrists, to 67 adult patients seeking psychoanalytic psychotherapy, in order to assess interrater reliability, internal structure, and construct validity. Results indicate that overall maturity of object relations stems from structural indices of self-object differentiation determined by a particular configuration of many positions, rather than from the thematic aspects included in the individual psychosexual positions.