Rustiyawan FH, Afifulloh M, Hakim DM, Sulistiani IRS, Hidayatullah MF, Muslim M. Implementation and Validation of the CIPPO Model: A Case Study at Nurul Fajri Senior High School Palasah, Majalengka Supporting SDG 4. J. Curr. Stud. SDGs. 2026;3(3):198. doi:10.63230/jocsis.3.3.198