Book excerpt: Improving the Measurement of Late-Life Disability in Population Surveys summarizes a workshop organized to draw upon recent advances to improve the measurement of physical and cognitive disability in population surveys of the elderly population. The book questions whether or not the measures of activities of daily living and instrumental activities of daily living used in many population surveys are sufficient as the primary survey-based indicators of late-life disability. If not, should they be refined or should they be supplemented by other measures of disability in surveys? If yes, in what ways should disability measures be changed or modified to produce population estimates of late-life disability and to monitor trends? The book also discusses what further research is needed to advance this effort.