School of Computing Science, University of Newcastle upon Tyne Dependable Composite Web Services with Components Upgraded Online A. Gorbenko, V. Kharchenko, P. Popov, A. Romanovsky Technical Report Series CS-TR-897 March 2005 Copyright c 2004 University of Newcastle upon Tyne Published by the University of Newcastle upon Tyne, School of Computing Science, Claremont Tower, Claremont Road, Newcastle upon Tyne, NE1 7RU, UK.