The expression Developmental Disorder (DD) is a broad concept that includes the Autistic Spectrum Disorders (ASD). DD is defined as any deviation in neurodevelopment below -1.5 standard deviations from the mean expected for the age. It is a limitation in the cognitive or adaptive functioning that begins in early childhood and produces behaviour disturbances at home, at school or at the community, or an intellectual deficit that can show as language delay, learning, reasoning or judgement disabilities, problem solving disability or inability for abstract reasoning.