Septianita, Septianita, and Handrie Noprisson. “Implementation of Waterfall Methodology in the Development of Posyandu Data Management System Based on Codeigniter Framework”. JSAI (Journal Scientific and Applied Informatics), vol. 7, no. 3, Nov. 2024, pp. 673-9, doi:10.36085/jsai.v7i3.7240.