Manatad, J.P. 2026. Teachers’ Awareness, Perceptions, and Challenges on the First-Year Implementation of the Expanded Career Progression System (2025) in the Department of Education. International Journal of Sustainable and Integrated Studies. 1, 3 (Oct. 2026), 868–878. DOI:https://doi.org/10.65339/ijsis.V1.I3.229.