The research was aimed to develop the model for utilization of external quality evaluation results for quality improvement of small-sized schools in northeastern Thailand using an application of organization development research which consists of 4 stages including (1) analysis and synthesis of concepts of utilization of external quality evaluation results, (2) construction of the model and handbook for using the external quality evaluation results, (3) trails of the model for utilization of external quality evaluation results, and (4) evaluation of the model for utilization of external quality evaluation results. It was found that the model for utilization of external quality evaluation results featured the systematic process of utilizing external quality evaluation results comprising input, process, and output. It was also found that the model had face validity, discriminant validity, and Standards with reference to utility, feasibility, propriety, and accuracy.