The Pareto solutions obtained from Section 4 contain a large numbers of optimal solutions. However, for practical composite drilling, a specific set of drilling parameters should be identified from the Pareto solutions , and this can be achieved by ranking all the available alternatives through MCDM. In this study, TOPSIS is deployed to rank the Pareto solutions based on the distance of one solution to the ideal positive solution (IPS) and ideal negative solution (INS) . The distance are defined as 𝑆𝑆 𝑖𝑖 + and 𝑆𝑆 𝑖𝑖 -, respectively. The overall performance index 𝐶𝐶 𝑖𝑖 * of each Pareto solution based on its proximity to the ideal solution can be calculated as: