3Di key features:

• computes the severity of features associated with a diagnosis of autism

• computes levels of behavioural adjustment

• establishes comorbidity across the full range of child psychiatric disorders

• allows an assessment for autism in as little as 45 minutes

• generates a comprehensive report suitable for parents and referrers

• liked by parents and carers

• excellent reliability and validity; criterion validity established in relation to the ADI-R

• no double-entry: for research, all data can be exported to SPSS

• provides an audit trail invaluable for clinical governance

Developed at The Institute of Child Health, University College London, and Great Ormond Street Hospital for Children, London