Autism Spectrum Disorder (ASD)/ Asperger's Syndrome is a developmental disorder that can present with significant social, communication and behavioural challenges. Level of impairment can vary across individuals. Attention Specific Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterised by some or combined difficulties in attention span, hyperactivity and impulsivity. Although usually diagnosed in childhood, ADHD can also persist in adulthood.