Anis Cholis; Ribut Margo Mulyanto; Achmad Yusuf; Sari Cahya Putri; Tuti Mutia. Evaluating the Effectiveness of The Smarts Didi Model in Enhancing Teacher Competency for Differentiated Instruction in Indonesia: A Confirmatory Factor Analysis Approach. Int. J. Geogr. Soc. Multicult. Educ. 2026, 3, 1-13.