<p>@hawkette:</p>
<p>Quite apart from my concerns about their collection methodology, I just don’t understand how we can make distinctions based on the letter grades when we don’t know what the letter grades represent. Is there a bell curve? How different is an A- from a B+? What about a B? I agree that an A is probably better than a C, but where is the brightline for distinguishing quality?</p>