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It is because the idea that computer automated grading software can be used in real life testing environments with actual students gets bureaucrats salivating at the "increases in efficiency" and "cost savings".
http://www.guardian.co.uk/education/mortarboard/2013/may/24/automated-marking-bad-for-essays
Think about it. An essay is an argumentative piece of prose; it's - in its finest form - something that elevates people like my avatar from mediocrity to shaping the world. It is intellectual, analysing, sarcastic. It is word-brawling with ideas and facts. The essay is an instrument for convincing other people about something.
How can you convince a machine about anything?
http://www.guardian.co.uk/education/mortarboard/2013/may/24/automated-marking-bad-for-essays
How would you like your work to be marked by a robot? If you're a student on a free online course – like those run by EdX – then you can expect to have your essays assessed through instant grading software. It works by recognising and rewarding the key words, phrases and structures in your work.
Using this type of technology on a free, unaccredited course is one thing but the New York Times recently reported that four US states – Louisiana, North Dakota, Utah and West Virginia – now use automated essay grading systems in secondary schools. Automated essay grading is also increasingly being used in large-scale standardised tests in the United States.
But academia is not on board. A petition against its use has collected 3,600 signatures, and has the support of the well-known computational linguist, Noam Chomsky. The petition argues that automated essay grading should not be used in any decision affecting a person's life or livelihood and should be discontinued for all large-scale assessments because "computers cannot read", or measure the essentials of effective writing.
Think about it. An essay is an argumentative piece of prose; it's - in its finest form - something that elevates people like my avatar from mediocrity to shaping the world. It is intellectual, analysing, sarcastic. It is word-brawling with ideas and facts. The essay is an instrument for convincing other people about something.
How can you convince a machine about anything?