Sounds easy doesn’t it, that is so, but only in theory. In real life situations it is far more challenging. For people to learn and adapt themselves in all walks of life, both rewards and punishment maybe necessary. If one thinks about it seriously, one realizes that it starts pretty early in life. Recall your school days, if you did well in class you would get a star, on the other hand if you did not you, you may have been kept back after school to do extra work and improve.