Bringing the 2012 IEEE World Congress on Computational Intelligence (IEEE-WCCI 2012) for the first time to Australia has been a fulfilling journey of joy and honour. This premier event of the IEEE Computational Intelligence Society (IEEE-CIS) brings together three flagship conferences of the society in even years. It consisted of these conferences: the International Joint Conference on Neural Networks (IJCNN 2012), the IEEE International Conference on Fuzzy Systems (FUZZIEEE 2012) and the 2012 IEEE Congress on Evolutionary Computation (IEEE CEC 2012). This document presents the technical papers from the IEEE CEC 2012 conference, which had 758 submissions, of which, 482 were accepted.