The study aims at using different quantitative methods of studying the South Slavic dialects, based on the different sets of dialectal features. We examine the linguistic complexity variance throughout the South Slavic territory and make attmepts to explain if and how complexity levels correlate with the (non)involvement of the different varieties, subdialects, and dialects in past and present language contact situations. We also conduct a dialectometric analysis of South Slavic dialects pertaining to the Serbo-Croatian dialect continuum based on phonetic and morphological features which can be characterized as innovations and archaisms.