Henry Peacham, in The Garden of Eloquence (1593), defines eutrepismus thusly:
[I]n latine called Bonus ordo, and Ordinatio, it is a forme of speech, which doth not only number the partes before they be said, but also doth also order those partes, and maketh them plaine by a kind of definition, or declaration.
Peacham also adds the following "Caution": 'It is verie behouefull to take heed that when the parte be numbred in generall, they be not forgotten in the particular prosecution: as he that promised to expound the twelve articles of the Creed, and after could remember but nine.'
So it would seem "Naming of Parts," or at least the sergeant-instructor's lesson, is also an example of a how-not-to.