MacArthur-Bates CDI: Lessons Learned from Making Language-Specific Versions

Despite differences across languages and cultures, CDI adaptations appear valid in exploring individual differences in language development across 69 spoken and signed languages/dialects. I explain under what conditions parent reports are valid; how we make linguistically appropriate adaptations; findings of differences in early “word” acquisition across languages, and theoretical and applied implications; and how gender differences across languages complicate identification of language delay.