• Discusses how awareness of autism has evolved, beginning with a relatively homogenous group of patients with obvious symptoms and increasingly including a wider range of patients with less obvious symptoms and less need for support
• Reviews the DSM and ICD diagnostic criteria for Autism Spectrum Disorder, teaching clinicians what each criterion encompasses, particularly in individuals who are less obviously autistic
• Describes traits and challenges that are not part of the formal diagnostic criteria, but which commonly co-occur in autistic individuals with less obvious traits
• Includes reflections from those with subtle autism who struggled to be diagnosed