Parent-Implemented Language Interventions for Children with a Developmental Delay: A Systematic Review

Young children with a developmental delay (DD) show significant delays in communication and language development.
Although several parent-implemented language intervention programs have been developed to facilitate the communication and language
abilities of children with a DD, no systematic review has examined the effects of these programs. Method: The literature search
for this systematic review focused on parent-implemented early language interventions for children with a DD age 1–5 years. Searches
were conducted in PubMed, Scopus, and Web of Science (search period 1974–2015). Level of evidence (levels I and II) as developed
by the American Academy for Cerebral Palsy and Developmental Medicine (AACPDM) and study effectiveness were evaluated. Seven
intervention studies met the inclusion criteria. Interventions comprised the Hanen Parent Program, Responsive Education/Prelinguistic
Milieu Teaching, and Enhanced Milieu Teaching. A substantial proportion of children with a DD also had a diagnosis of
Down syndrome (DS). Results: Five of the seven studies reported a significant effect of intervention on parent responsiveness, child
communication, and aspects of language interactions (favoring intervention groups over control groups), but no studies reported significant
effects of intervention on expressive language vocabulary. Conclusions: Intervention programs aimed at facilitating the communication
and language development of children with a DD appear to improve a child’s general communication abilities but have
limited impact on expressive language development.