The OJKO project is an international collaboration project between the universities of Leuven (Belgium) and Groningen. With the OJKO project, we want to better understand how the development of children with PIMD occurs, how to explain changes (such as gaining or losing skills) over time, and what we can do to support the development of these children. Development is a complex topic and there’s little research on the development of these children. The OJKO project is a first step.