doi:10.1016/j.cirp.2020.03.012engGil Vilda, F.Yagüe-Fabra, J.A.Sunyer Torrents, A.An in-plant milk-run design method for improving surface occupation and optimizing mizusumashi work timeART-2020-118240Product customization is becoming a competitiveness factor in most markets. It implies manufacturing small and varied batches in mixed-product assembly lines and frequently supplying parts to production lines in small quantities with high efficiency. The in-plant milk-run is a specific tool used in this context. This paper proposes an industry-validated design method for human-driven milk-runs, based on improving surface productivity. A mathematical model is defined for relating mizusumashi work time to the milk-run period and finding its minimum value. This research is particularly useful in factories with high cost per m2 supplying high-volume parts.2020http://zaguan.unizar.es/record/10614410.1016/j.cirp.2020.03.012http://zaguan.unizar.es/record/106144oai:zaguan.unizar.es:106144CIRP Annals 69, 1 (2020), 405-408All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess