Infant Vocabulary Checklist (OZI-LF)

Introducing the OZI

Parents are experts on their child’s communication development. Asking parents to report on which words their child says and/or understands has been shown to be a reliable way to measure communication development, for children under 3 years.

The OZI (pronounced OZ-eye) is a parent checklist of children’s communication. It is an adaptation of the MacArthur-Bates Communicative Development Inventory.

The OZI is for children aged 12-30 months and has norms (for details see Kalashnikova, Schwarz & Burnham, 2016, DOI: 10.1177/0142723716648846). You can find the norms for the OZI on just go to Norms and make sure to select Australian English.

The OZI contains 558 items and takes 20-45 minutes to complete depending on the age of the child and how many words they say/understand. (If you need a shorter version, you might consider the OZI Short Form, or OZI-SF).

The OZI is to be used only for research or clinical purposes. To request permission to access and use the OZI, please provide your personal and institutional information below and the purpose for which the OZI will be used. All publications that use the OZI must acknowledge its use by citing: Kalashnikova, M., Schwarz, I-C. & Burnham, D. (2016) OZI: Australian English Communicative Development Inventory. First Language, 36, 407-427. DOI: 10.1177/0142723716648846.

Click here to request permission to use and download the OZI

If you have further questions about the OZI, please contact: Dr Marina Kalashnikova <>