Ratnawati, F., Hardinata, N. and Supendi 2025. This study developed a Certainty Factor (CF)–based expert system to support nutrition consultation and stunting prevention in coastal settings using Bengkalis Regency as a case study. A design science approach was employed to analyze local service constra. JURNAL TEKNOLOGI DAN OPEN SOURCE. 8, 2 (Oct. 2025), 530 - 539. DOI:https://doi.org/10.36378/jtos.v8i2.4858.