Abstract:In May 2014, shortly after Bernd Krieg-Bruckner's 65th birthday, and shortly before he was going to retire as a professor at Universitat Bremen, Prof. Lu Ruqian proposed us to prepare a special issue of the International Journal of Software and Informatics for this occasion. However, this could not be done within just four months. Fortunately, it turned out that there would be a still better occasion to prepare such an issue: In September 2015, Bernd will finish the last international EC-funded project that he directed for three years, and will enter the life of a proper professor emeritus who has no administrative obligation any more, but can still occupy himself with whatever he finds interesting ......