Department of Computing Science Christina Olsén Reseacher, PhD   Department of Computing Science MIT- building, room E 443 Umeå Univeristy    SE-901 81 Umeå   SWEDEN         Telephone: +46(0)90 786 77 88   Fax: +46(0)90 786 61 26   Email: colsen@cs.umu.se           Home Publications Teaching Links