In its narrow sense, school instruction is called education. In this process, the elders of the society strive to attain predetermined aims during a specified time by providing pre-structured tidbits of knowledge to children through set methods of teaching. The purpose is to achieve mental development of children entering school. In this process, the teacher is expected to instill in the child's mind ready made dozes of knowledge. By this child can develop into a parrot repeating crammed knowledge mechanically, but he cannot attain the wholesome development of his personality.