For those who like taxonomies, typologies and classification schemes
Taxonomy and typology are often used in the same way, a typology rather defines types based on similarity of features/concepts whereas a taxonomy rather defines types (taxa) based on identity, i.e. all its members share the same feature(s)
This category includes all sorts of entries that include one ore more interesting classifications schemes, taxonomies, typologies.
See also: the Knowledge representation category (for tools that allow to create taxonomies)