Many Medicaid and CHIP programs and private health plans are pursuing medical home initiatives aimed at improving the quality of health care, but varying conceptual definitions and measurement goals have led to the development of a number of different medical home measurement tools. This Evaluation Highlight, funded by the U.S. Department of Health and Human Services, examines the measurement of "medical homeness" in selected CHIPRA Quality Demonstration projects, describes the development of the Medical Home Index-Revised Short Form (an adaptation of the Medical Home Index survey), and presents preliminary statistics on medical homeness for demonstration practices in six States.