The Czech adaptation of the MacArthur-Bates Communicative Development Inventories: Words and Sentences, standardized on a sample of 493 Czech children. The lexical inventory includes 564 words, parents mark which words their child uses. The resulting score can be compared with norming tables showing the percentile corresponding to each value. In addition to the lexical inventory, the method contains five shorter sections mapping various aspects of grammatical and combinatorial language development.