This research presented a model of cooperative/collaborative learning technique which leads to learning efficiency of students continued from a previous research (Porntip, 2012). Objectives were to study and find out patterns of study groups of a classroom case study that would have effects on the student efficiency. Formulating the model and data analysis, the researcher used Structural Equation Modeling for explaining the effects on the efficiency of a group of students. A theoretical subject case study of the Interior Architecture Program in the Faculty of Architecture, Mahasarakham University was used in this research.