The CDI: Words and Gestures (Infant form) is designed for use with 8- to 16- month old children. The CDI: Words and Sentences (Toddler form) is designed for use with 16- to 30-month old children. Either form may be used with older, developmentally-delayed children.
Further information about these forms including normative data is provided in the MacArthur Communicative Development Inventories User's Guide and Technical Manual.
The manual as well as the forms can be ordered from Brookes:
For international orders, go directly at:
See REFERENCES page.