The problem isn't just that the system doesn't give enough feedback. The problem is that it also gives it at the wrong time. In the real world, if your own te

The problem isn't just that the system doesn't give enough feedback. The problem is that it also gives it at the wrong time. In the real world, if your own testing misses a bug, you don't find out until it's live and causes a problem. In most grading systems, if your own testing misses a bug, you don't find out until the grader's (hopefully more comprehensive) testing catches it and you lose points. In this system, if your testing misses a bug, you're immediately told that a bug exists, and given no other information -- but there's no actual penalty for doing this. In the real world, you're told what the incorrect behavior is, but there's a penalty in that this incorrect behavior has at least inconvenienced someone.