Objective: To develop and test a brief measure of changes in eating, active play, and parenting practices after an intervention to help parents shape children's choices and home environments. Design: Sequential phases of development and testing: expert panel review, cognitive testing interviews, field testing, test-retest study, and assessment of convergence with detailed previously validated instruments. Setting and Participants: Expanded Food and Nutrition Education Program (EFNEP), New York State. Low-income parents of 3- to 11-year-old children; Cooperative Extension nutrition and parenting educators. Main Outcome Measures: Questionnaire reliability, validity, respondent comprehension, and feasibility of use in program contexts. Analysis: Qualitative analysis of item comprehension. Correlational analysis of test-retest reliability and convergent validity. Results: A behavior checklist was developed to assess change in parent-reported family eating, physical activity, and parenting practices addressed by an intervention. The checklist was feasible for use in EFNEP and questions were understood as intended. Test-retest reliability was good (r = 0.83) and scores correlated significantly (range, 0.25 to -0.60; P less than 0.05) with detailed measures of dietary habits, parental modeling, physical activity, and home environment. Conclusions and Implications: Development and testing in a program context produced a tool community nutritionists can use to evaluate educational interventions aimed at helping parents promote healthful eating and activity. (Contains 5 tables.)