Naomi Feil developed the method "Validation" between 1963 and 1980 in response to dissatisfaction with traditional methods of working with very old disoriented. In 1982 he published Validation: The Feil Method, of which this book is an updated and revised. Among other books and scientific articles, Naomi Feil has also published The Validation Breakthrough. Currently, the method "Validation" is applied worldwide and is part of training programs and caregivers gerocultores geriatrics.