For decades, the diagnostic criteria for conditions such as Autism and ADHD left countless individuals without answers or adequate support. Today, there has been a sharp acceleration in formal diagnoses. At the center of this shift is a sharp acceleration in diagnoses and a growing recognition of how different neurotypes intersect - most notably, the frequent co-occurrence of Autism and ADHD, now widely referred to as "AuDHD."

In many countries, not all of them, autism is often classified into 3 levels based on the amount of support an individual needs in daily life.