Paris Avgeriou Symeon Retalis Manolis Skordalakis Building Quality into Learning Management Systems - An Architecture-Centric Approach. 312-324 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2784&spage=312 2002 conf/er/2002 ER (Workshops) db/conf/er/erw2002.html#AvgeriouRS02