2025. The development of outcome-based education (OBE)-oriented teaching materials through problem-based and project-based learning for the elementary science education course . Primary: Jurnal Pendidikan Guru Sekolah Dasar. 14, 6 (Dec. 2025), 835–851. DOI:https://doi.org/10.33578/jpfkip.v14i6.835-851.