Preface / vi IJCAI-07 Conference Organization / vii IJCAI-07 Awards and Distinguished Papers / xii IJCAI-07 Keynote and Invited Speakers / xiii IJCAI Organization / xv Past IJCAI Conferences / xvii IJCAI-07 Reviewers / xviii IJCAI-07 Technical Papers and Posters Research Excellence Award Abstract Cooperating Reasoning Processes: More than Just the Sum of Their Parts / 2 Alan Bundy Computers and