Bright Start TN Clearinghouse


Infant Developmental Inventory (IDI) Part of the Developmental and Behavioral Screening Strategy

What is it?

The Infant Developmental Inventory (IDI) is a screening questionnaire for children birth to 18 months. The IDI asks parents questions about their child’s behaviors, activities, developments, and any questions and concerns parents may have. Parents report their child’s skills in five areas: social, self-help, gross motor, fine motor, and language. The IDI takes approximately 10 minutes to complete. 

What is the evidence base?

IDI has high sensitivity (85 percent) and high specificity (77 percent). Sensitivity is the accuracy of the screener in classifying a child with delayed development. Specificity is the accuracy of the screener in classifying a child who is not delayed. Sensitivity and specificity levels of 70 percent to 80 percent are deemed acceptable for screening tests. Parent IDI reports provide an accurate indicator of children’s developmental status. 

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