The impact of substance abusers' readiness to change on psychological and behavioral functioning.

Heather and Rollnick's (1993) Readiness to Change Questionnaire directly measures the first three stages of behavior change: precontemplative, contemplative, and action. As part of the St. Louis Target Cities project, an automated assessment procedure was developed to assess individuals seeking substance-abuse services on a variety of dimensions, including readiness to change. This paper describes relationships among the Readiness to Change scales, client self-reports, staff evaluations of psychological symptoms, and other intake assessment measures used in the St. Louis project.