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What Is a CRS? A classroom response system (sometimes called a personal response system, student response system, or audience response system) is a set of hardware and software that facilitates teaching activities such as the following. A teacher poses a multiple-choice question to his or her students via an overhead or computer projector, perhaps using PowerPoint to do so. Each student submits his or her answer to the question using a handheld transmitter (often called a “clicker”) that beams an infrared or radio-frequency signal to a receiver attached to the teacher’s computer. Software on the teacher’s computer collects the students’ answers and produces a histogram showing how many students chose each of the answer choices.