“…The past and the recent literature introduce several assignment strategies for both less-than-UL systems and UL warehouses (Caron, Marchet, & Perego, 2000;Clausen, Dabidian, Diekmann, Goedicke, & Poting, 2013;Daniels, Rummel, & Schantz, 1998;Muppani & Adil, 2008b;Pan, Shih, Wu, & Lin, 2015;Park & Seo, 2009;Poulos, Rigatos, Tzafestas, & Koukos, 2001;Roodbergen, 2001;Rosenblatt & Roll, 1984). Order picking and order batching strategies aim to minimise the expected travel time, or order cycle time, considering several factors, e.g.…”