inventio (invention): The process of developing and refining your arguments.
dispositio (arrangement): The process of arranging and organizing your arguments for maximum impact.
elocutio (style): The process of determining how you present your arguments using figures of speech and other rhetorical techniques.
memoria (memory): The process of learning and memorizing your speech so you can deliver it without the use of notes. Memory-work not only consisted of memorizing the words of a specific speech, but also storing up famous quotes, literary references, and other facts that could be used in impromptu speeches.
actio (delivery): The process of practicing how you deliver your speech using gestures, pronunciation, and tone of voice.