Thousands of physician directory Web sites have been developed by hospitals, physician groups, health plans, state medical boards, and other organizations. Previous Fund-supported work showed that most of these Web sites have missing or out-of-date information, as well as severely limited search capabilities. Recent Fund support enabled the National Committee for Quality Assurance (NCQA) to convene an advisory group to create standards for physician directories. Based on the advisors' recommendations, the Midwest Business Group on Health will conduct a demonstration project in which a group of Chicago-based health plans, hospitals, and physician organizations will implement the recommended standards and evaluate the cost and value of doing so. This work should yield a blueprint for creating physician directories that meet NCQA-recommended standards.