Teaching

In order to teach any subject, an instructor needs certain requirements:

1. Subject knowledge
2. Teaching skills
3. A goal
4. A syllabus
5. Topics
6. Discrete lessons
7. Proof

An expert must have at least 10,000 hours of practice behind them.
Dr. K. Anders Ericsson found that this was true of any art; whether tai chi chuan, dancing or playing the piano.