The number of students taking courses online is surging, creating a dilemma for educators who want to prevent cheating.

Do you trust students to take an exam on their own computer from home or work, even though it might be easy to sneak a peek at the textbook? Or, do you force them to trek to a proctored test center, detracting from the convenience that drew them to online classes in the first place?

The quandary is one reason many online programs do little testing at all. But new technology that places a camera inside students' homes might...

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