In 1964, the International Sport Organization for the Disabled (ISOD) was created. They created the first formal classification system, which had 27 classes. This was reduced to 12 classes for the 1976 Summer Paralympics and was further reduced to nine classes for the 1992 Summer Paralympics. During the late 1960s and early 1970s, the classification system, set up as a series of "handicaps", was seen as problematic because in an effort to clearly describe a disability and promote fairness, the number of classifications made the organisation of competitive events difficult. There were too few people in a classification to the point where an international event for people with disabilities said "1000 competitors = 1000 winners." There were some exceptions to this in classes like double leg paralysis as a result of brain or spinal injury and single leg amputations.