Institutio Oratoria

Others, who seem to me to have been no less desirous than those mentioned above to introduce some novelty, have added order, although they had already mentioned arrangement, as though arrangement was anything else than the marshalling of arguments in the best possible order. Dion taught that oratory consisted only of invention and arrangement, but added that each of these departments was twofold in nature, being concerned with words and things, so that expression comes under invention, and delivery under arrangement, while memory must be added as a fifth department. The followers of Theodorus divide invention into two parts, the one concerned with matter and the other with expression, and then add the three remaining departments.

Hermagoras places judgment, division, order and everything relating to expression under the heading of economy, a Greek word meaning the management of domestic affairs which is applied metaphorically to oratory and has no Latin equivalent.