15. The system of claim 13 , wherein assigning relative weights uses human rated benchmark essay responses.
15. The system of claim 13 , wherein assigning relative weights uses human rated benchmark essay responses. 17. The system of claim 15 , wherein assigning relative weights comprises using n number of human scored benchmark essays scored by each of k human raters, wherein n and k are selected to satisfy the inequality: 0.08 ≥ 1.2 ⁢ 1 - [ 0.8 ⁢ k 1 + ( k - 1 ) ⁢ 0.8 ] 2 n .