
Understand PDA Through the Eyes of a Young Person Who Lives With It
A heartfelt first-person account helping parents, teachers and autistic readers understand what living with PDA really feels like—through lived experience, not medical jargon.
Ethan didn't learn to read until he was ten years old. At eighteen, he published his first book.
Amazon UK & Australia #1 Bestseller

Pathological Demand Avoidance (PDA) or Pervasive Drive for Autonomy is one of the most misunderstood profiles on the autism spectrum, but this book changes that. Written by 18-year-old Ethan Knight, The PDA Effect offers an honest, first-person guide to living with PDA, sharing what really helps, from decision-making and daily routines to friendships and self-advocacy.
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"Great insights about living with PDA and ways to help"
Loved this book, easy to read and so much I could relate to in terms of how I think our PDAer experiences life. I highly recommend this and think it would be great for anyone trying to understand themselves or the PDA profile - the writing is clear and not too wordy, meaning it could be good for younger tweens and teens, and for siblings of PDAers. It would also be great for explaining PDA to extended family and friends. Maybe even busy educators and health professionals could find time to squeeze it into their day.
Steph Curtis (Author of PDA in the Family)
"A Masterclass in PDA and Autism"
Brian, Autism Support Community

eBook
£4.95
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Signed Paperback
£8.95
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All profits go to the author
Ships from the UK

Signed Large Print
£9.95
Ideal for readers who prefer larger, clearer text, including many dyslexic, visually impaired and neurodivergent readers.
All profits go to the author
Bundle deals available when you add more books to cart.
Ships from the UK

Written by Ethan's older brother, Callum Knight, at just 16 years old, this Amazon #1 bestseller helps parents, teachers and autistic readers understand autism through lived experience.
11+
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ISBN (Paperback): 978-1917514170
Page count: 113
Publication date: May 2025
This book is available at the British Library
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