For evaluating their system,<cite> Mohler et al. (2011)</cite> collected student responses from an online learning environment. 80 questions from ten introductory computer science assignments spread across two exams were gathered together with 2,273 student responses. These responses were graded by two human judges on a scale from zero to five. The judges fully agreed in 57% of all cases, their Pearson correlation computes to r = 0.586. The gold standard has been created by computing the arithmetic mean of the two judgments for each response. The Texas system achieves r = 0.518 and a Root Mean Square Error of 0.978 as its best result.