The study extended previous research on the use of node-link mapping during counseling by addressing the effect that this visual representation technique has on clients with attentional problems. Participants were 13 counselors in a methadone treatment program and their 93 opioid-addicted clients who had been in treatment for more than 3 months. Both counselors and clients were randomly assigned to mapping-enhanced or standard counseling. Based on a self-report measure assessing attention-related problems of clients, they were categorized as having either adequate or poor levels of attentional stamina and attentional control. Consistent with previous findings, clients in mapping-enhanced counseling had lower percentages of urine samples that were positive for cocaine or heroin. In addition, results suggested that mapping has greater benefits in terms of session attendance and program perception for clients with poor attentional stamina. Figure, tables, references