 The research concentrates mainly on the regional distribution of dialect similarities, such as cores of dialect and overlapping zones, which can be labelled according to a more or less slight variance of dialect between bordering locations.However, analysis of dialect relationships cannot always be clearly depicted by cladistics, since there are often dialect continuum cases and also examples with elements of convergence, as well as division.Language atlases serve as an empirical database which document the dialect profile of a large number of locations in detail.