“…In all of the research performed in permutation and non-permutation flowshops, researchers developed a heuristic algorithm to solve the problem (Aggoune & Portmann, 2006;Chang, Chen, & Liu, 2007;Kuo et al, 2009;Liao & Huang, 2010;Mehravaran & Logendran, 2012;Ruiz & Maroto, 2005;Srikar & Ghosh, 1986;Yagmahan & Yenisey, 2010;Ying, 2008) but only some of them, including us, developed a mathematical model (Kuo et al, 2009;Liao & Huang, 2010;Mehravaran & Logendran, 2012;Srikar & Ghosh, 1986), to optimize the objective function and provide an assessment for the quality of their heuristics. However, they did not consider dual resources either in permutation or non-permutation flowshop.…”