A taxonomy is a way of organizing things into useful and convenient classes. Each class can then be treated as an abstraction of the individual elements. For example, Dog is a class of Animal. Once an individual entity is classified as a Dog, generalizations can be made about what to expect from the individual entity. There can be many taxonomies that classify entities. For example, one taxonomic classification places an individual in the animal kingdom; however, another taxonomy classifies an individual according to their state of employment (working, retired, etc.). Each is valid; the only difference is perspective.
The DIDO RA employs the following four taxonomies: