Not simply an instrument for doing multiple choice questions but a medium for in-depth discussion among teachers and students. Teachers can also get immediate and direct response from students, even those who are reluctant to talk. 表決器不單只讓同學即時做選擇題，還可鼓勵同學發表意見，加深討論層次。就連最不愛表達意見的學生，老師也有機會了解他們的看法。