Educators in Texas say student-response systems, also referred to as clickers, help engage students in lessons by adding a video-game element to classroom instruction. The devices -- being used in several Dallas-area districts -- allow students to respond to questions instantly, and teachers say they use the feedback to tailor instruction to students' needs. "You can't teach with just pencil and paper," one veteran teacher said. "Because children have changed, we need to change."

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