Ans Withagen has years of experience as a special educationalist at a school for visually impaired children at Royal Dutch Visio. Her expertise lies in the field of the tactual development of blind children. At the beginning of 2000, she and a project group started developing a Tactual Profile for children who have been blind from birth. This instrument is now used worldwide and was validated in 2005. She did a PhD study on tactual functioning of blind children. Subsequently, she led many projects to stimulate the tactual development of blind children. She also wrote a curriculum on how to teach braille with some colleagues.