These ribbons encourage students to take extra quizzes that have absolutely no effect on their grade.

FORBES: Education Meets 'World Of Warcraft'

SocialPsych encourages students to take optional multiple-choice quizzes during their free time to earn badges certifying mastery of a subject.

FORBES: Education Meets 'World Of Warcraft'

Rather than writing papers, they take a series of multiple-choice quizzes.

NEWYORKER: Laptop U

Chase Elementary School, is in a tough, almost entirely Spanish-speaking, Chicago neighborhood, yet 40 or so kids come to school an hour early each day just to take one of the company's Accelerated Reader computer quizzes.

FORBES: Instant feedback in the classroom