McConnaughy, E.N., Prochaska, J.O., & Velicer, W.F. (1983). Stages of change in psychotherapy: Measurement and sample profiles. Psychotherapy: Theory, Research and Practice, 20, 368-375.
I have prepared an outline of the stages of change and related interventions at each stage. See file attached. See Wheel version of SOC on the Dual Diagnosis Channel - webinar attached.