Real-World Effectiveness of Early Language Intervention: Evidence From a Nationwide Rollout of the Nuffield Early Language Intervention in England

This study is methodologically unusual in providing converging evidence from an RD analysis for an intervention previously demonstrated to be effective in a series of RCTs. The findings demonstrate that NELI can be successfully implemented at scale and lead to meaningful improvements in children's oral language skills. For educators and speech-language pathologists, this evidence supports the wider adoption of NELI as a practical, evidence-based intervention to address children's early language weaknesses in school.