Hallvard Trætteberg John Krogstie Enhancing the Usability of BPM-Solutions by Combining Process and User-Interface Modelling. 86-97 2008 PoEM http://dx.doi.org/10.1007/978-3-540-89218-2_7 conf/ifip8-1/2008 db/conf/ifip8-1/poem2008.html#TraettebergK08