Ancient rhetoric

The Greeks got there first. We think we know how to write a piece of propaganda, or how to plan a speech. But the Ancient Greeks had a clearly set-out sequence for how to arrange such a piece. A speech comprises six stages:

1. exordium
2. narratio
3. divisio
4. confirmatio
5. confutatio
6. peroratio

What do these stages mean? Any educated Hellenic Greek could have told you. I have no idea. 

A literary composition would have five sections:

1. inventio
2. disposition
3. elocutio
4. memoria
5. pronuntiatio or actio

All this is according to Brian Vickers, in the TLS of 5 October 2007. But he doesn't tell us where he got these terms from.