Communicative Development Inventories (CDIs) in etiologically diverse developmental conditions: A systematic review.
CDIs can chart atypical language growth across diagnoses, but check psychometric fit and track kids longitudinally.
01Research in Context
What this study did
The team pulled every paper that used Communicative Development Inventories (CDIs) with kids who have autism, Down syndrome, or other delays.
They asked: Do the check-ups track language the same way in each group?
After sorting the stack, they saw the tool can chart odd growth paths, yet its trustworthiness swings from group to group.
What they found
CDIs can map unusual language curves across conditions, but the scores do not always line up with lab tests.
One-time use for screening is risky; tracking the same child over months gives clearer pictures.
How this fits with other research
Brown et al. (1994) already showed the same CDI form can spot depression signs in kids with delays, proving the checklist works for feelings as well as words.
Kumar et al. (2025) scanned quality-of-life studies in DCD and also urged clinicians to collect both parent and child views, echoing the call for multi-point CDI data.
Smits-Engelsman et al. (2018) found big gains after motor training in DCD; their review reminds us that once CDIs flag delay, we still need proven actions to follow.
Why it matters
Before you hand a CDI to parents, check if the form has solid norms for that child’s condition.
Pick the long view: schedule repeats every few months instead of one-and-done screening.
When scores dip, pair the data with direct language samples and move fast into evidence-based language teaching.
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02At a glance
03Original abstract
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.
Research in developmental disabilities, 2026 · doi:10.1016/j.ridd.2026.105256