Given the 5th & 6th paragraphs about "correctness signal" and "process signal" it seems like the obvious solution would be to do both, i.e. ask questions that a

Given the 5th & 6th paragraphs about "correctness signal" and "process signal" it seems like the obvious solution would be to do both, i.e. ask questions that are easy alongside those that are hard. The easy ones are "process questions" and the hard ones are "correctness questions." Or maybe you have a range of difficulty from easy to hard, and each question has a number attached to it from 0 to 1 that reflects its intended use.