When I was young, I met a farmer in his farmland. He pointed one of his workers and told me that this person would be a supervisor in the future. I asked him: why? He showed me the difference between this worker compared to others. Few years later, that person was promoted as the farmer said.

Later in my life, I comprehend the heart of the message the farmer submitted to me. It was actually not to simply proving a prediction, but to find distinguishing factors about; what causing someone become a supervisor, while other people still become ordinary workers for years long, so that they never get any better positions, or higher payments.

The questions would be: why there are so many workers who have never been promoted to be a supervisor? What about being a supervisor of supervisors? Isn