The Strength Pareto Evolutionary Algorithm (SPEA) [9] is an elitist Multi-Objective Evolutionary Algorithm (MOEA) since it ensures that good solutions found in early runs are only replaced if better solutions are discovered. The algorithm achieves it by maintaining an external population View the MathML source consisting of a fixed number of non-dominated solutions found before the beginning of the simulation. If new non-dominated solutions are found during the simulation, they are compared with the existing external population and the resulting non-dominated solutions are stored. The external population participates in the genetic operators with the current population expecting to influence the population towards good regions of the search space. Below one iteration of the algorithm step-by-step is described [9]. Initially, a population P0 of size N is randomly created, and the external population View the MathML source with maximum capacity of View the MathML source is empty.