BOBY, a special medical aid, is used for exercising and rehabilitation for children with disabilities. In order to make the guidebook clear and demonstrate the exercises to parents, we prepared custom-made illustrations of each exercise and in each position, to help make the most of the aid’s potential. The parents use the guidebook daily when exercising with their child and we believe that it is a good and easy-to-use aid. One illustrative picture can replace several verbal descriptions - so the use of the illustration in a series of examples is much more appropriate than just a product description or its photograph.