At some point we're all sitting too close to our project to see that we're being confusing. Instruction manuals are perfect examples. I'm sure the technical writer thought he was being crystal clear, I mean he understood the manual perfectly. How much better (and useful) would that manual be if only he had given it to a “head-scratcher” to read over first. By letting the head-scratcher share her confusion, we'd all be better able to “insert tab A into slot B.”
Everyone needs a head-scratcher. Someone outside your culture who can point out what's not totally clear about your idea, your promotion and your project before the real confusion sets in.