This, to a certain extent, is similar to grouping athletes by age, gender or weight. Classification across the Paralympic Movement is governed by the IPC Athlete Classification Code and Standards.

Classification attempts to impose a hierarchy on the complex and dynamic variety of life on Earth by describing how different species group together and how they are related to one another or not.

The grouping of families was added to allow the ... and as new species are identified they can be fitted into the current classification system. As more scientific methods developed, it allowed ...