This interactive online registry is a database of diet and physical activity measures relevant to childhood obesity research. Types of measures in this registry are questionnaires, instruments, diaries, logs, electronic devices, direct observation of people or environments, protocols and analytic techniques. Details about each measure include validity, reliability, protocols for use, as well as settings, geographic areas, and populations in which the measure has been used. Users can search for measures and details about how to use them, find measures in development, link to other measures registries and related resources, and submit new measures for inclusion.