“…Rashid [13] presented a review of optimization methods, objective functions, and specific constraints used in solving two-sided assembly line balancing problems. The majority of the researches on twosided assembly line balancing problem focused on single-model production, see for example Kim, Kim [14], Lee, Kim [15], Kim, Song [16], Ozcan and Toklu [17], Ozbakir and Tapkan [18], Purnomo, Wee [19] and Li, Tang [20]. However, mixed-model lines are also utilised frequently in industry though they have been received less attention.…”