Herman Emanuel Nggano, Imron Arifin, and Bambang Budi Wiyono. 2025. “The Principal’s Role in Implementing TQM at Frateran Catholic High School, Surabaya: Exploring the Principal’s Concrete Actions in Implementing TQM Principles at Frateran Catholic High School, Surabaya”. Al-Afkar, Journal For Islamic Studies 8 (4):505-11. https://doi.org/10.31943/afkarjournal.v8i4.1864.