Yes or No: Make your recruiter smarter

In response to Dana’s last post about writing effective screeners, c_perfetti asked:

I agree open-ended questions in a screener are best.
But one reason some usability professionals use ‘yes/no’ questions is because they don’t have confidence that the external recruiters can effectively assess what an acceptable open ended answer would be.
In some cases, they may find that asking a ‘yes/no’ question is the safer approach.
How would you handle this concern?

Dana answers that what c_perfetti needed was a smarter recruiter and goes on to saying there are two things one can do to make your recruiter smarter: brief her on the study, and give her the answers.

Yes or No: Make your recruiter smarter