Writing good questionnaires can prove the diference between getting a phenomenal response or sitting at your desk waiting for your email to bleep.
When using multiple choice, never use 1-5 because it allows people to choose 3, thus sit on the fence and not give an opinion either way. We always use 0-5, which looks very similar but because we extend it to 6 options (by moving down numerically, not up) we ensure that people must sit on either the positive or the negative side of the fence.