Abstract
The article analyzes the MacArthur Communicative Development Inventory (CDI) as a means of research and diagnostics of children's speech in different languages. It takes into account the data from Stanford University websites, which deal with findings resulted from the analysis of completed questionnaires. The sites provide abundant information concerning adaptations of this tool for more than 100 languages and a database of children's passive and active lexicons for 29 languages (including Russian). Moreover, on the basis of 23 languages, they show unique and universal character of word usage in the speech of young learners studying several different languages simultaneously. This article also provides research findings on the bilingual children’s early vocabulary (with Russian as the Heritage language) under the RFBR grant No. 19-012-00293.
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