In dairy industries throughout the world there is a desire to optimize udder health. An improved udder health will lead to improved animal welfare, improved production efficiency and a reduction of the use of antibiotics. To improve udder health, first of all, technical knowledge on issues such as treatment, milking, infectious pressure and host resistance is important. However, over the years we learned that knowledge alone is not enough: knowledge has to be used. And for knowledge to be used, farmers have to be motivated. This requires knowledge about motivation and communication. In this...