The Fourth IASTED International Conference on Computational Intelligence (CI 2009) will be a major forum for international researchers and professionals to present their latest research, results, and ideas in all areas of computational intelligence. All papers submitted to this conference will be double-blind peer reviewed by at least two members of the International Program Committee and related technical committees. Acceptance will be based primarily on originality, significance, technical soundness, presentation, and references. The conference chair makes the final decision on the acceptance or rejection of the paper. CI 2009 will be held in conjunction with the IASTED International Conferences on: · Signal and Image Processing (SIP 2009) · Internet and Multimedia Systems and Applications (IMSA 2009) · Identification, Control and Applications (ICA 2009)