“…Note that this benchmark was used for testing various metaheuristic approaches recently appeared in the literature as (Cicirello & Smith, 2005), (Liao & Juan, 2007), (Cicirello, 2006), (Lin & Ying, 2006), (Anghinolfi & Paolucci, 2008) and (Anghinolfi & Paolucci, 2007b). The benchmark was produced by generating 10 instances for each combination of three different factors usually referenced in the literature (for a definition and discussion see, e.g., (Pinedo, 1995)): the due date tightness δ, the due date range R, and the setup time severity ξ, selected as follows: δ∈{0.3, 0.6, 0.9}, R∈{0.25, 0.75}, ξ∈{0.25, 0.75}.…”