This clear, scientifically rigorous and practical approach has the potential to radically improve our care of this most deserving group of people with intellectual disabilities. I cannot recommend it more highly to professionals working in the field.;Allan Skelly, PhD, PsychD, AFBPS, Consultant Clinical Psychologist, Gateshead, UK, & Former Chair of The Faculty for People with intellectual Disabilities, British Psychological Society; How can we help those with intellectual disability (ID) live in the world and relate to those around them in the most content and happy way possible? What can we do to help them thrive? Sappok (a medical doctor), Zapperitz (a behavioral specialist), and Hudson (a clinical psychologist), have used the emotional development approach to understand challenging behaviors encountered at different stages of development in those with an intellectual disability. This detailed book, of use to clinicians, physicians, psychologists, psychiatrists, physical/speech/language/occupational therapists, mental health professionals, learning disability nurses, special education teachers, dentists, parents, families and caregivers, gives us a useful road map for understanding developmental stages and needs over the lifetime. It is especially valuable in that it provides suggestions, ideas and solutions for how to deal effectively with challenging behaviors in those with ID. ;Marcie Parker, PhD, CFLE, Excelsior, MN, USA, in Issues in Mental Health Nursing (2022), 43, 390-391;