Invention

Invention (Canons of Rhetoric) is the act of formulating ideas and to search for information to make a persuasive argument. Invention is key in many forms of work including writing, and making different materials. Aristotle defines invention as "discovering the best means for persuasion."

Invention in Writing

Although Aristotle came up with many ideas and connections, these are not all of the starting points for ideas

Invention in Devices
Inventions according to devices is actually making a physical product from different materials. The thought process may be the same as with writing, but devices are used in different ways than in writing.