This report is based on a rethinking of the concept of motivation, which is redefined here as purposeful, intentional, & positive — directed toward the person’s best interests. This report shows how substance abuse treat. staff can influence change by developing a therapeutic relationship that respects & builds on the client’s autonomy & makes the treat. clinician a partner in the change process. Describes motivational interventions that can be used at all stages of the change process, from pre-contemplation & preparation to action & maintenance, & informs readers of the research, results, tools, & assessment instruments related to enhancing motivation.