Cancer screening can improve the length and quality of life, yet the average American receives only half of recommended services. Patient-centered personal health records with higher levels of functionality, combined with practice redesign to make use of these functions, can help patients obtain recommended cancer screening tests by linking them to their doctor's records, explaining information in lay language, displaying tailored recommendations and educational resources, providing logistical support and tools to stimulate action, and generating reminders. This project will measure whether making these resources available to primary care practices and patients promotes shared decision-making and increases the delivery of cancer screening compared to existing information systems.