A question used by some salespeople at the end of their discovery is, "What else should i be asking you that I haven't yet?"
The theory behind it is good, but the delivery is not, since it places all of the burden of the thinking on the listener.
There is a better alternative, that makes it easier for them to answer, anf for you to get great information.
You'll hear the exact formula for this, so you can create your own, effective, "What else?" questions.
The Art of Sales with Art Sobczak