The Health plan Employer Data and Information Set (HEDIS) is limited in its scope of women's health-related performance measures. Realizing this, the National Committee for Quality Assurance developed the Women's Health Measurement Advisory Panel (MAP) to expand and develop HEDIS measures to better represent women's health issues. This paper outlines the development of several new women's health-related performance measures and highlights the complexities of creating new measures to assess the quality of care provided to women through our nation's managed care organizations.