Coincidental with many things changed is the development of the society. I agree that in any field—business, politics, education, government—those in power should be required to step down after five years.       The reasons of the leaders could lead to the company losing the vital. , because the good leaders can boldly foresee the trend of technological development in the future. But some leaders lose the bravery of advancing and can not hear some useful advise so that  the development of company stops and is facing the danger of bankruptcy. A good example of this is the Nokia Company.  Its marker share was ever the first in the mobile phone area, but the first place is replaced or supplanted by the Apple Company. Because the Nokia company does not expect the time of smart phone to come, it misses the opportunity of occupied占领the market. Compared with the Steve Jobs of the Apple company, the leaders of the Nokia company do not have the accurate准确的 and acute敏锐的 smelling on the judge of the technology of foreseeable, daring大胆的 and creative things and the future trend of the mobile phone market. Furthermore, the unchanged degree of the Nokia Company’s leaders is difficult to be understood. They are not willing to use the best solution that adds the software of Google Company on the hardware of the Nokia Company. Comparing with this, Steve Jobs threw the past inconsistency 矛盾 and became the important cooperator with the Intel company. This makes people respect to the tolerance of Steve Jobs. From this point, the tolerance of the leaders of Steve Jobs is not big enough so that it impedes the development of the company.      The new leaders could bring some benefits and disadvantages into the development of career. And at the certain time it has benefits towards these areas, such as the sports. In 2002, after the Chinese man basket team losed the Asian champion, Li Yuanwei became the president of the Chinese national basketball team and replaced Xin Lancheng. The benefits are that bring the new ideas, reform some things out of date and renew the outside of the Chinese basket. For example, Li Yuanwei changed a new head coach, who is a famous coach in Europe. And the Chinese Basketball Association converted the nonprofessional sport into professional sport. Admit the Chinese players to go into the higher association in order to improve their abilities, such as Yao Ming and Yi Jianlian in NBA. But the change has disadvantages. Because the new president is unfamiliar with the employees and operating systems. It engendered the chaos in a short time. When Li Yuanwei president arrived at the Chinese Basketball Association, he had no office and worked at the underground. Some journalists interviewed him and can almost not found him. And Li Yuanwei wanted to do something and can also not find the responding employees. In a sum, the Chinese national man basketball team ranked the eighth team in the Beijing Olympic game and the Chinese national woman basketball team rank the fourth team because of Li Yuanwei's hard work. So it is beneficial for the sports to change the leaders in a certain time.       To judge the level of a leader needs to consider whether he has the wisdom, the long sight and intolerance or not. Steve Jobs is a prime example of this. Steve Jobs has an extraordinary wisdom and can foresee the trend of technological development. In 1976, he dared to say that the computer would go into the home of common people and become the necessary tools, so he established the Apple Company and invented the first personal computer. And in 2007, Iphone was born and was strongly welcomed by the consumers. The Iphone combines the feeling of customer with the technology perfectly. This appears to be simple, but it is rare that the persons who discover this and put it into practice. Jobs is really not a common person. He is not only a person with wisdom, but he also has the tolerance. After he was in the power again, he made the Apple company become friends with the Intel Company which was always the enemy of the Apple Company. This kind of tolerance is an ability that one leader who really wants to have an accomplishment in a field must have.        I agree that in any field—business, politics, education, government—those in power should be required to step down after five years.