Learn about sources of health state values in this 12-minute lecture from Professor John Cairns of the London School of Hygiene and Tropical Medicine, delivered at Kyoto University Graduate School of Medicine. Explore methods for estimating relative values of time spent in different health states and understand how survival is weighted to produce QALYs (Quality-Adjusted Life Years) and DALYs (Disability-Adjusted Life Years). Part of a comprehensive series on Economic Evaluation of Health Technologies, this lecture segment provides essential knowledge for healthcare economics and policy analysis.