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I don't think "marked by computer" automatically means multiple choice "standardized tests".

English homework can't be graded by computer, but subjects like math, physics, and chemistry could conceivably be checked by computer. There'd be some details to work out, such as how to "show work", but it could work.

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At least one (and almost certainly more) company pursuing this. The service WebAssign is used in almost every science class at my high school. 90% of homework is done (and graded) via the site. However, the lack of any "show-your-work" functionality sometimes limits teachers' ability to assist students.

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