CEVAP:

In his work Phaedrus (265 c-e), Plato proposed that whenever we think about something, we must engage in both ‘synagógé’ and ‘diairesis’, that is ‘collection’ and ‘division’.

• Collection is evidently to consist in bringing together specific Ideas under a common generic Idea.

• Division is the hierarchical arrangement under that generic Idea of all its constituent sub-genera and specie.