Leonor Barroca José Luiz Fiadeiro Michael Jackson Robin C. Laney Bashar Nuseibeh Problem Frames: A Case for Coordination. 5-19 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2949&spage=5 2004 conf/coordination/2004 COORDINATION db/conf/coordination/coordination2004.html#BarrocaFJLN04