Is theoretical knowledge important to one's career achievement? (Part 2) On the other hand, we should recognise the fact that theories are not the only factor of being success. It is interesting to not that a great number of successful men are considered to have the similar personality traits. Those who are optimistic, passionate, industrious and good at interpersonal skills can conquer difficulties and cooperate with others, and then achieve success efficiently. Another factor contributing to success might be social network, through what people can collect information, ideas and various resources. For instance, businessmen are willing to get more information easily because they know how to keep close relationship with governments, which skill does not probably appear in textbooks.