Erlina Yuliastuti 2025. APPLICATION OF THE PROJECT-BASED LEARNING MODEL IN ELEMENTARY SOCIAL STUDIES LEARNING PLANNING TO DEVELOP 21ST CENTURY SKILLS. International Journal of Educational Review, Law And Social Sciences (IJERLAS). 5, 4 (Jul. 2025), 3702–3707. DOI:https://doi.org/10.54443/ijerlas.v5i4.3840.