Of the hundreds of questions I "grill" my client with - I think it's about 137 to be exact - these are the core, foundational ones that you must know before writing a word.

This is an evaluation you can use to evaluate your advertisements.  It can be kind of hard to swallow if you get caught failing it.

"Who else can say that?" is an evaluation question you can use to evaluate your writing - especially your headlines.
Pay close attention to this one.

Think of your marketing & advertising copy as an army of tiny salesmen. You personally couldn't give a sales presentation to 50,000 individuals, but you can let your army of tiny salesmen - YOUR COPY - present the same compelling message that you would in person.