Setiyawan, I.A., Pasaribu, D.M. and Hikmahtiar, R. 2025. The Legal Force of Change Order Instruction for the Work in Construction Contracts: A Case Study of Substation Development in Central Sumatra. SIGn Jurnal Hukum. 6, 2 (Feb. 2025), 452-467. DOI:https://doi.org/10.37276/sjh.v6i2.409.