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Tool name

MacArthur-Bates CDI

Use to evaluate

Language and communication skills

Age range

8–37 months (may also be used with older children who have developmental delays)

Completed by

Parents or caregivers (or as interview by professional); professionals score

Time commitment

Each form generally takes 20–40 minutes to complete and 10–15 minutes to score

Capture parents’ knowledge of their child’s emerging language skills

The MacArthur-Bates Communicative Development Inventories (CDIs), and the corresponding Spanish-language Inventarios, provide a systematic way for professionals to use parents as informants regarding their child’s language. They enable professionals to tap into parents’ knowledge about their young children’s communicative development for use in screening and developing a prognosis for children with language delays. It also ensures they are meeting mandates for including parent input in child evaluation procedures.

The goal of the CDIs is to yield reliable information on the course of language development from children’s early signs of comprehension, to their first nonverbal gestural signals, to the expansion of early vocabulary and the beginnings of grammar.


  • valid and reliable
  • developed by top language researchers
  • parent focused


What You'll Need


CDI 2e English Set with CDI III


View in Store


User's Guide and Technical Manual

Words & Gestures forms

Words & Sentences forms


Additional products and resources

Additional products and resources

Other languages