About.

The ASL-CDI 2.0 is a vocabulary assessment for young children learning ASL. Parents answer a set of questions about their child's ability to understand and produce ASL signs.

Short Form

The short form gives a rough sense of the child's vocabulary size, and how this compares to other children. The short form is relatively easy for parents to complete. 

Long Form

The long form gives a more detailed picture of the child's vocabulary. It provides information about not only how many signs the child knows, but which kinds of signs the child knows and is still learning.

Part II

For children younger than 36 months old, and may not know very many signs, we also ask a series of questions about the child's communicative play. If the child is in this age range, we will automatically ask the Part II questions.

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Learn more about the research & development

This article describes the procedures used to develop the ASL-CDI 2.0, and what this assessment has revealed about how children learn signs.

Caselli, N., Lieberman, A., Pyers, J. (2020). The ASL-CDI 2.0: An updated, normed adaptation of the MacArthur Bates Communicative Development Inventory for American Sign Language. Behavior Research Methods.