Setyawan, S. and Harianto , E. . (2025) “Operational Innovation Design Using The Blue Ocean Strategy Approach To Increase Project Production Cost Efficiency At PT. Kiabadi Jaya Fasadindo”, Eduvest - Journal of Universal Studies, 5(11), pp. 13531–13543. doi: 10.59188/eduvest.v5i11.51980.