Autism Spectrum Disorder (ASD) is a term used to describe a group of lifelong neurodevelopmental disabilities characterized by the manifestation of behavioural characteristics across multiple areas of functioning. ASD is defined and diagnosed through the observation of behaviours. Characteristics are observed, in varying degrees, in social relationships, communicative competence, pattern and range of interests, and sensory responsiveness. The impact of ASD can range from mild to severe, and may improve or change across an individual’s life. Students with ASD exhibit impairments in:

• communication;
• reciprocal social interaction; and
• restricted repetitive patterns of interests and behaviours.
• The Ministry of Education uses the definition of ASD as defined in the Standards and Guidelines for the Assessment and Diagnosis of Young Children with Autism Spectrum Disorder in British Columbia, produced by the Ministry of Health. ASD includes all of the following DSM-1V and ICD-10 categories:
• Autistic Disorder
• PDD-NOS/Atypical Autism
• Asperger Disorder/Syndrome
• Rett Syndrome
• Childhood Disintegrative Disorder