Discussion on "GIS-based kinematic slope instability and slope mass rating (SMR) maps: Application to a railway route in Sivas (Turkey)" by Işık Yilmaz, Marian Marschalko, Mustafa Yildirim, Emek Dereli and Martin Bednarik, Bulletin of Engineering Geology and the Environment 71 (2012), 351-357, doi:10.1007/s10064-011-0384-5