2. The method of claim 1 wherein said grading method is selected from Order Equivalence, Formal Equivalence and Content Equivalence grading methods.
2. The method of claim 1 wherein said grading method is selected from Order Equivalence, Formal Equivalence and Content Equivalence grading methods. 17. The method of claim 2 wherein said receiving comprises receiving the encoded equation-based response from a plurality of response devices.