Chairul Alfatory; Bintang Rafly Aryansyah; Mahendra Mahendra; Andhika Danisvara; Yudi Prastyo. Improvement of the Early, Middle and Final Patrol Check Process From Manual to Digital With the PDCA Method, Fishbone Diagram, and Why-Why Analysis at PT. Automotive Components Company. IJMECIE 2026, 3, 01-13.