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An investigation into differences in early childhood development

Variability in Early Communicative Development demonstrates that the "modal child" does not, in fact, exist. Interviews with parents of over 1,800 children reveals both typical and exceptional communication development between the ages of eight and 30 months, providing unusually specific detail on the variability of individual lexical, gestural, and grammatical skills. Discussion of the Macarthur Communicative Development Inventories delves into the inventory's reliability, validity, and interrelations,...

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The CDI: Words and Sentences Forms are for use with children ages 16a 30 months. In the first part of each form, parents document the childa s production and use of hundreds of words divided into semantic categories. The second part analyzes the early phases of grammar, including the childa s understanding of word forms and the complexity of the childa s multi-word utterances. Parents identify the words the child has understood or used and provide written examples of the childa s three longest sentences.

These forms are part of the...