People with cerebral palsy were first included at the Paralympic Games in 1980 in Arnhem, the Netherlands at time when there were only four CP classes. In the next few years, a CP sports specific international organization, CP-ISRA, was founded and took over the role of managing classification. The system then started to move away from a medical based classification system to a functional classification system. This was not without controversy as it represented a move to allow people with different types of disabilities to compete against each other, and there was pushback as a result. A major overhaul of classification took place during the 2000s. At the same, individual sports began to develop their own sport specific classification systems.