Robert Glaska Maximilian Pühler Petra Wolf Helmut Krcmar Assisting Needs Driven Requirements Engineering with the ARIS Toolset. 56 2008 Software Engineering conf/se/2008 db/conf/se/se2008.html#GlaskaPWK08 http://subs.emis.de/LNI/Proceedings/Proceedings121/article1984.html