| Improvement | Aimed knowledge and skills | Questions required to be answered in classroom management | |
| Much bigger scale | Increase in the amount of information (accumulation of information) | The information increase on the basis of much bigger improvement | Where there is any accumulated information, “how to teach?” |
| Faster | Increase in information diversity | The information diversity increase on the basis of faster improvement | Where there is various information to teach, “which to teach?” |
| Shorter intervals | Obsolescence in the content of information | The content of information that increased in amount and diversity on the basis of shorter improvement becomes rapidly obsolescent. | When the information that increased in number and diversity change in shorter intervals, “why to teach” such temporary information? |