Rates of overweight children and adolescents have nearly tripled over the past 30 years. Many barriers exist to healthy eating and physical activity for children and adolescents, including factors in the school and community environment. It is these modifiable school environmental factors that led to the development of the Nutrition Friendly Schools and Communities (NFSC) model to prevent the development of overweight in children and adolescents. Development of the NFSC model built upon the Coordinated School Health Program, the Baby Friendly Hospital Initiative, Participatory Research, and Empowerment Evaluation. The purpose of the NFSC environmental intervention is to actively engage the school community to prevent overweight in students through a multi-level participative intervention that facilitates coordinated changes in the school environment in the following areas: health education, physical education, health services, food services, school policy, staff wellness, psychosocial services, and family/community involvement. The NFSC model is the basis by which school communities develop a plan and evaluation that lead to a healthy school environment and prevent the development of overweight in children. A pilot study of the NFSC model is currently being conducted in eight low-income, minority, urban schools. This paper describes the development of the NFSC model and criteria. (Contains 1 table and 1 figure.)