Septianita, S. and Noprisson, H. 2024. Implementation of Waterfall Methodology in the Development of Posyandu Data Management System Based on Codeigniter Framework. JSAI (Journal Scientific and Applied Informatics). 7, 3 (Nov. 2024), 673–679. DOI:https://doi.org/10.36085/jsai.v7i3.7240.