“…It also is easy to see that even if some similarities can be found, the problem considered here is unique in comparison with the models developed for the assembly line balancing problems, as for U-lines (Baykasoglu, 2006;Chiang et al, 2007;Özcan and Toklu, 2009), two-sided lines (Simaria and Vilarinho, 2009;Hu et al, 2010;Roshani et al, 2012), and multiple U-lines (Yegul et al, 2010;Yazgan et al, 2011;Agpak et al, 2012;Rabbani et al, 2012). Indeed, the tasks assigned to the different workstations but performed by the same worker in U-lines can be seen as different machining modules of a turret but with other types of precedence and layout constraints involved.…”