In this thesis we modelled functional regions as Travel-To-Work Areas (TTWA) by using CURDS method (Coombes in Bond, 2008). Case study of Slovenia was performed for years 2009 and 2011. Statistical data on inter-municipal commuting were base for modelling TTWA. Analysis and comparison of TTWA between two years showed some changes in size, number and shape of TTWA. We performed also comparative analysis for TTWA and statistical regions in Slovenia, as well as for TTWA and functional urban regions defined by the Strategy of spatial development of Slovenia (SPRS, 2004). The results of this thesis, and especially description of CURDS method, can contribute to different studies of functional interactions in Slovenia.