ABDILLAH, Shelya Putri Nurhaliza; SARI, Dian Permata. Optimization of Employee Certification System UI Using User-Centered Design Model. Dinasti International Journal of Education Management and Social Science, [S. l.], v. 6, n. 4, p. 3247–3260, 2025. DOI: 10.38035/dijemss.v6i4.4450. Disponível em: https://dinastipub.org/DIJEMSS/article/view/4450. Acesso em: 17 aug. 2026.