Children’s language impairment is one of the most prevalent developmental conditions. Long term effects are largely unknown. Previous work using the ALSPAC cohort has shown that language impairment in early childhood (2 and 4 years) contributes to poorer emotional and behavioural functioning in mid-childhood. The proposed study will use the rich dataset to identify children with language impairment at the age of 8 years and investigate the relationship between speech/language impairment in childhood and subsequent impact on selected outcomes in early adulthood. These outcomes will include educational attainment, employment and antisocial activity. The results will feed into a large programme grant to NIHR, with the aim of evaluating an approach to language impairment interventions that are accessible, acceptable, and effective for children with language impairments from a range of social backgrounds in order to improve their language development and psychosocial functioning.