Friedrich-Alexander-University Erlangen-Nürnberg, Germany Pedro J. Clemente Miguel A. Pérez Sergio Lujan Hans Reiser 13th Workshop for Phd Students in Object Oriented Programming: Summary and Accepted Papers Technical Report TR-I4-03-03 2003-10-06 Informatik 4 (Distributed Systems and Operating Systems) Prof. Dr. Wolfgang Schröder-Preikschat