Moreover, the chromosome (particle) structure combined with the decoding procedure can be used with any meta-heuristic techniques such as the Tabu search, genetic algorithms, ant colonies and artificial immune systems, among others. The comparison of the HPSIL algorithm with the GAs presented by Othman et al., 2011 and Hajiaghaei et al., 2010, and LINGO shows that the HPSIL algorithm provides an equal or better solution compared to the others.