This volume contains the papers selected for presentation at the 15th International S- posiumonMethodologiesforIntelligentSystems, ISMIS2005, heldinSaratogaSprings, NewYork,25 28May,2005. ThesymposiumwasorganizedbySUNYatAlbany. Itwas sponsored by the Army Research Of?ce and by several units of the University at Albany including its Division for Research, College of Arts and Sciences, Department of C- puter Science, and Institute for Informatics, Logics, and Security Studies (formerly the Institute for Programming and Logics). ISMIS is a conference series that was started in 1986 in Knoxville,...