reliability and internal consistency were good across all behavioral areas investigated in the interview. The interview was also found to have adequate reliability across time. Research comparing ADI-R results of autistic children and children with other developmental disorders suggested that individual questions on the interview were slightly more valid when discriminating autism from intellectual disability than the algorithm as a whole. However, further research has led to overall acceptance of the ADI-R algorithm. Related instruments The social communication questionnaire (SCQ) is a brief, 40-item, true/false questionnaire, completed by parents regarding the behavior of their child. It parallels the ADI-R in content and is used for brief screening to determine the need to conduct a full ADI-R interview. The autism diagnostic observation schedule (ADOS), is a companion instrument by the same core authors. It is a semi-structured set of observations and is conducted in an office setting as a series of activities involving the referred individual and a psychologist or other trained and licensed examiner. See also Autism diagnostic observation schedule Autism Society of America Autism Speaks Epidemiology of autism Michael Rutter References External links Autism Resource - Glossary of Terms Western Psychological Services - ADI-R Materials ADI-R in other languages Autism screening and assessment tools