The 13th issue of a serial “Research on Slavic Dialectology” contains articles devoted to the theme of Slavic dialects’ contacts with language idioms of different types and to the results emerging after such contacts. The problem of special status of area aggregation of dialects localized in the zones of dialectal/language contacts is particulary discussed. The problem of substratum is examined as a variant of contact on the diachronic level. The question of contacts is explored both in linguistic and ethno cultural aspects.