Monitoring early childhood development is essential to support optimal growth. In many institutions, including TK Bina Pertiwi, manual record-keeping leads to errors, reporting delays, and unstructured archiving. This study designs a web-based monitoring system using the Rapid Application Development model (Requirements Planning, User Design, Construction, Cutover) and evaluates development outcomes with the Mamdani fuzzy logic method using three inputs (cognitive, psychomotor, socio-emotional) to produce outputs of “Needs Stimulation” or “Developing.” The system was implemented with the Laravel framework and MySQL and tested via Black Box and White Box testing. Black Box testing showed that all 15 functional scenarios (100%) ran as expected, while White Box testing of 10 core modules produced cyclomatic complexity values V(G) of 1-4, indicating a well-structured, low-risk program flow. A user acceptance questionnaire completed by 12 respondents further yielded a feasibility score of 94%. Results indicate the system replaces manual records, speeds up reporting, and provides centralized data access for Admin, Principal, Teachers, and Parents, thereby making monitoring coordination more effective.
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