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Oxford CDI Studies

Communicative Development Inventories (CDIs) are tools for measuring vocabulary size and growth. These vocabulary 'checklists' have a long history in the study of language development. CDI studies at the Oxford University BabyLab employ a UK CDI to measure standardized vocabulary score in the local UK population, and to model growth as a function of age (see below). You can try out the Online CDI Tool to find out how many of our standard test-words your child understands. An alternative approach uses statistical modelling to estimate the possible size of a toddler's total vocabulary, based on a CDI score. You can try out the online Vocabulary Size Estimator.

The Oxford Communicative Development Inventory (OCDI)

A UK adaptation of the MacArthur-Bates CDI




If you use the Oxford CDI form, the Oxford CDI Online or the Oxford CDI database available from this website, please cite: