Communication
Knowledge and ability to explain
Ability to demonstrate
Patience
Motivation
ABILITY TO ANALYZE
What the student in doing
Where the student is looking
A good lesson gives the student something new and reinforces something previously taught or learned. You do not 'hit' a student with the sense that he is 'wrong', far better to suggest a change or reference material to be studied.

Failure to fly frequently means that forgetting will become an important part of the learning problem. Far better is the total immersion into flying since it leaves no room for procrastination.