यह जानने के लिए कि छात्रों को पढ़ाया गया विषय पूरी तरह समझ आया है या नहीं, शिक्षक को प्राप्त होने वाली जानकारी कहलाती है:

According to research on human perception and learning (Pike's Law / Edgar Dale's Cone of Experience), approximately what percentage of human learning takes place through the sense of sight?

For an effective classroom teaching-learning process, the teacher should give topmost priority to: