In this meta-analysis, we evaluated the effects of parent-implemented interventions on the vocabulary and general language development of young children at-risk or with primary language impairments (LI) and children with developmental disorders with a secondary language impairment.

• • A primary language impairment refers to children who have an expressive and/or receptive language disorder but no other significant disability.
  • A secondary language impairment refers to children whose primary disability affects their language skills, like children with Autism Spectrum Disorder (ASD) or hearing impairment.