Geert Poels Jim Nelson Marcela Genero Mario Piattini Quality in Conceptual Modeling - New Research Directions. 243-250 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2784&spage=243 2002 conf/er/2002 ER (Workshops) db/conf/er/erw2002.html#PoelsNGP02