“…Some authors (Han et al, 2012;Wu, Qian, Ni, & Fan, 2012;Karaboga & Ozturk, 2011) propose random generation of the food sources (solutions) to guarantee diversification of solutions. Some others propose generating at least one of the solutions by a heuristic procedure in order to obtain one food source of a certain quality (Tasgetiren, Pan, Suganthan, & Chen, 2011b). However, in Liu and Liu (2013), a GRASP based on an NEH algorithm (Nawaz, Enscore, & Ham, 1983) is used to generate all food sources in order to guarantee an initial swarm of quality and diversity.…”