Want to know what Alan Turing has to do with essay writing? Check out my 2013 presentation, "If It Walks Like a Duck: Turing's 'Test' and Automated Essay Evaluation":
https://docs.google.com/presentation/d/1j3wLDoz1n8YMAhhMP4CVzY9ZGQd9zNxboRmsmKjYiks/edit?usp=sharing
Alternatively, here's a nice summary of the talk by Lindy Briggette:
http://urienglish.com/2014/01/10/kenna-barrett-explores-turings-test-automated-essay-evaluation/
~Kenna