UNIVERSITY OF DORTMUND REIHE COMPUTATIONAL INTELLIGENCE COLLABORATIVE RESEARCH CENTER 531 Design and Management of Complex Technical Processes and Systems by means of Computational Intelligence Methods Gradient-based/Evolutionary Relay Hybrid for Computing Pareto Front Approximations Maximizing the S-Metric Michael Emmerich, Andr´ e Deutz and Nicola Beume No. CI-232/07 Technical Report ISSN 1433-3325 June 2007 Secretary of the SFB 531 · University of Dortmund · Dept. of Computer Science/XI 44221 Dortmund · Germany This work is a product of the Collaborative Research Center 531, “Computational Intelligence,” at the University of Dortmund and was printed with financial support of the Deutsche Forschungsgemeinschaft.