Department of Software Technology and Methodology, Eötvös Loránd University, Budapest, Hungary. andras.lorincz@elte.hu|Department of Software Technology and Methodology, Eötvös Loránd University, Budapest, Hungary. andras.lorincz@elte.hu|Department of Software Technology and Methodology, Eötvös Loránd University, Budapest, Hungary. andras.lorincz@elte.hu