This article presents a model for research on the effects of school organizational heath factors on primary school academic achievement in Trinidad and Tobago. The model can be applicable for evaluating schools in other developing countries. As proposed, the model hypothesizes relationships between external factors (exogenous variables), school-level factors (endogenous variables), and school outcomes (student achievement and positive school climate). The endogenous variables are sub-scales of school organizational health. They include principal leadership, psycho-social environment, school-home-community relationships, teacher characteristics, curriculum quality, and school culture. These subscales are partially influenced by the Organizational Health Inventory OHI (Hoy and Feldman, 1987) and by school health indices set forth by the World Health Organization (1996). It is hoped that this school organizational health model can provide a conceptual tool for formulating a more comprehensive measure of healthy schools. (Contains 1 figure.)