The authors take the reader step by step through the diagnostic criteria, incorporating the latest research as well as quotes from over 100 autistic contributors that bring that research to life. They also describe many aspects of autism that are not included in the current diagnostic criteria, such as autistic strengths and co-occurring disorders. Readers will learn about highly relevant topics, such as different types of empathy, sensory systems that are not well known, neuro-crash and burn out, and relative versus absolute thinking. This book provides a deep, current, and neurodiversity-affirmative understanding of the less obvious presentations of autism. It is relevant to all healthcare professionals, educators, family members, autistic individuals, and anyone who is curious about autism. A clinical companion guide, , is available for clinicians who make mental health diagnoses.