The way of learning depends on sight and hearing audio visual assessment to evaluate children's learning efficiency. The sense of hearing is also called the sound perception. It is necessary to check whether they are lacking the development of the following four steps if learning for children is stagnant.

— Being able to listen means they have the ability to speak, read, write and recognize words.

— Being able to speak, read, write and recognize words means they have the ability to think.

— Being able to think means they have the ability to absorb knowledge.

— Being able to absorb knowledge means they can learn grammar.