A goal without a method is nonsense.

The system that people work in and the interaction with people may account for 90 or 95 percent of performance.

When asked what single event was most helpful in developing the Theory of Relativity, Albert Einstein replied, "Figuring out how to think about the problem".

If you do not know how to ask the right question, you discover nothing.

Without theory, there are no questions.

When a worker has reached a stable state, further training will not help him.

Whenever there is fear, you will get wrong figures.