शिक्षण-अधिगम प्रक्रिया को निम्नलिखित में से किस सूत्र (maxims) की ओर की यात्रा माना जाता 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: