There is persistent evidence that breast cancer screening techniques remain under-utilized. While physicians cite lack of time as a barrier to the provision of preventive services, nurses and other medical office staff are in an ideal position to educate women and motivate adherence to screening recommendations. This paper describes the design, implementation and process evaluation of a breast cancer screening educational program targeting primary care medical office staff. This intervention was conducted in two Washington State counties as part of a larger community organization study. The PRECEDE model, educational outreach principles and focus groups were used to guide the program development. Consistent with ‘academic detailing’ concepts, the sessions were delivered at health care facilities. The program included a review of breast cancer-related data and screening methods, an overview of the nurse‘s role as a ’change agent9 and breast self-examination instructor, and a discussion of women's barriers to mammography. Community-level penetration was relatively high, with sessions being completed by approximately 50% of the eligible staff. Overall, participants were positive about the value of the program. Medical office-based educational sessions have the potential of reaching a large proportion of primary health care workers and increasing disease prevention in communities.