Hasan, M. et al. 2026. Principal management in improving student discipline to support science learning effectiveness at SMPN 1 Jatinangor and SMPN 12 Bandung City. Indonesian Journal of Teaching in Science. 6, 1 (Mar. 2026), 1–12. DOI:https://doi.org/10.17509/ijotis.v6i1.98372.