Methods of functional regional taxonomy and concrete definitions of functional regions based on prevailing population flows have been discussed in many regional studies. The resulting regions have been given various names (travel-to-work areas, local labour market areas, housing market areas, etc.) based on the character of the input data and the method of their definition. However, in most cases only one country (or part thereof) at a time has been analysed. The paper brings a unique definition of functional regions with comparable parameters suitable for international comparisons. Three Central European countries with different settlement and regional structures are analysed. The functional regions in all countries are objectivised through the operation with the constraint function, which estimates natural and non-normative values for the self-containment and size parameters. Two interaction measures are used in the regionalisation algorithm. Besides the methodological contribution, the role of spatial behaviour is briefly discussed, and an interpretation of the results and a proposal for the possible application of functional regions in regional planning and regional analysis in international research tasks is given.
K E Y W O R D SCentral Europe, daily travel-to-work flows, functional regions, regional analysis, regional planning, spatial behaviour ---