IFS Abstracts Collection The IFS Abstracts Collection consists of a selection of abstracts of scienetific papers published by staff at the Department of Software Technology, Vienna University of Technology. Please note, that this set was compiled for experimental purposes only. The complete listing of publications at the IFS can be retrieved via the IFS homepage at http://www.ifs.tuwien.ac.at/ifs/ For further information and comments, please contact me at rauber@ifs.tuwien.ac.at Andreas Rauber Department of Software Technology Vienna University of Technology Vienna, Austria