Intervention: The PRO-SELF© Plus PCP is based on three key strategies: (a) provision of information, (b) skill building, and (c) nurse coaching. The 10-week educational program comprises a structured part (teaching of pain management skills including the use of a weekly pillbox, the use of a pain management diary and written instructions on how to communicate with the physician about unrelieved pain) and a tailored part. The patient's answers on questions about his knowledge of pain management serve as basis for tailoring the teaching (academic detailing).