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Node–link mapping is a visual representation system that can be used in group and individual counseling sessions to illustrate clients' problems, issues, and plans. One hundred sixty-nine methadone treatment clients and their 10 counselors evaluated each of their individual and group sessions during a 2.5-month period by using the Session Evaluation Questionnaire (W. B. Stiles, 1980) and map rating items. A series of multivariate analyses of variance and correlational analyses indicated that the use of mapping—including the quantity and quality of mapping—was positively related to higher ratings of session depth by both clients and counselors. In addition, mapped group sessions were rated higher on several evaluative dimensions than were mapped individual sessions.