The research purpose was to develop an evaluation model for the internal quality assurance system of the dramatic arts College of Bunditpattanasilpa Institute. The Research and Development method was used as research methodology which was divided into three phases; developing the model and its guideline, trying out the actual implementation of the developed model, and assessing and improving the model. Data collection processes started with interviewing experts in internal quality assurance system. Then the collected data was analyzed and synthesized to form a tentative model. The researcher spent eight months on trying out this tentative model. The four areas; Utility, Feasibility, Propriety, and Accuracy were used to evaluate and revise the model. Percentage, mean, and standard deviation were used in data analysis. The tentative model consisted of three steps; preparation, evaluation procedure, and reporting. This model was tried out at two institutes in Kalasin and Roi-Et Provinces. The evaluation result as a whole on Utility, Feasibility, Propriety, and Accuracy of the model by eighty users was at the “Highest” level (Mean = 4.51). The utility was at the “Highest” mean of 4.60. In conclusion, this evaluation model for internal quality assurance system could be used successfully at the dramatic arts College of Bunditpattanasilpa Institute.