Communicative Development Inventories (CDIs) in etiologically diverse developmental conditions: A systematic review.

This review looked at how a language assessment tool called CDI works for children with different developmental conditions like autism and Down syndrome. CDI uses parent reports to track early language skills including gestures, vocabulary, and grammar. The tool shows promise for understanding how language develops differently in various conditions, but researchers found it needs improvement to be more reliable and useful for screening children who need support.

This systematic review examined the use of MacArthur-Bates Communicative Development Inventories (CDIs) across various neurodevelopmental and genetic conditions including autism, Down syndrome, Williams syndrome, and others. CDIs are parent-report tools originally designed for typically developing children aged 8-36 months to assess early language development, gesture use, vocabulary, and morpho-syntactic abilities. The review synthesized literature showing condition-specific patterns of expressive vocabulary development and highlighted the value of longitudinal data collection. While CDIs show promise for tracking language trajectories and informing early support, the authors identified challenges regarding reliability, validity, and suitability as screening tools, emphasizing the need for longitudinal, cross-condition, and cross-cultural research approaches.

CDIs show promise for tracking language development in neurodevelopmental conditions but require careful interpretation. Clinicians should prioritize longitudinal assessment approaches rather than single timepoints. The tool may be more valuable for monitoring progress than for screening or diagnosis until reliability and validity concerns are addressed.

The review identifies methodological concerns including cross-linguistic adaptation issues, reporting biases, and limitations of single-timepoint assessments. Sample size was not reported, and challenges remain regarding reliability and validity of CDIs across different clinical populations and cultural contexts.

The MacArthur-Bates Communicative Development Inventories (CDIs) are widely used parent-report tools for assessing early language development, including gesture use, expressive and receptive vocabulary, and early morpho-syntactic capacities. While originally developed for typically developing children aged 8 up to 36 months and aimed at detecting developmental language disorder, CDIs have been increasingly applied in studies of neurodevelopmental and genetic conditions, where language development often diverges from typical trajectories. In this review, we synthesize literature on the use of CDIs in a range of clinical populations, including autism, Down syndrome, Williams syndrome, cerebral palsy, Angelman syndrome, DDX3X syndrome, 5p deletion syndrome, fragile X syndrome, and others. We highlight condition-specific patterns of expressive vocabulary development, discuss the value of longitudinal data collection using CDIs, and visualize age trends that capture change and variability across developmental pathways.

Particular attention is given to methodological considerations such as cross-linguistic adaptations, reporting biases, and the limitations of single-timepoint assessments. While CDIs show promise for tracking language trajectories and informing early support, challenges remain in ensuring their reliability, validity, and suitability as screening tools. We conclude by emphasizing the importance of longitudinal, cross-condition, and cross-cultural approaches to better understand atypical language development and to improve the utility of CDIs in both research and applied settings.