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Objective To examine the cost‐effectiveness of Be Active Eat Well (BAEW), a large, multifaceted, community‐based capacity‐building demonstration program that promoted healthy eating and physical activity for Australian children aged 4‐12 years between 2003 and 2006. Design and Methods A quasi‐experimental, longitudinal design was used with anthropometric data collected at baseline (1001 children—intervention; 1183—comparator) and follow‐up. A societal perspective was employed, with intervention resource use measured retrospectively based on process evaluation reports, school newsletters, reports, and key stakeholder interviews, and valued in 2006 Australian dollars (AUD). Outcomes were measured as Body Mass Index (BMI) units saved and Disability Adjusted Life Years (DALYs) averted over the predicted cohort lifetime, and reported as incremental cost‐effectiveness ratios (with 95 …