"Beginning in fall 2010, we moved to automated scoring exclusively, using Pearson’s Intelligent Essay Assess or (IEA). IEA is the automated scoring engine developed by Pearson Knowledge Technologies to evaluate the meaning of text, not just writing mechanics. Pearson has trained IEA for the CLA using real CLA responses and scores to ensure its consistency with scores generated by human raters."
Link below: https://www.pdf-archive.com/2017/06/06/cla/cla.pdf
Most of you are more knowledgeable about technology than I am. So I'll leave it to you to decide if using an algorithm to grade an essay-based exam of critical thinking is a valid approach to this problem.