The ATN research registry was established in 2008. Information on children diagnosed with ASD is collected in this registry for ongoing and future research. Each Developmental Paediatrician involved in the ATN work can refer patients into the registry within a year after diagnosis. Information is collected from parents and from the diagnosing clinician. A cognitive and language assessment is completed if not already done. All this information is placed anonymously in the registry; information is collected annually for a period of three years in order to track treatments and outcomes for each of these children.