Researchers have suggested that one"s emotional intelligence (EQ) is a greater indicator of success and satisfaction than his intellectual intelligence (IQ) contrary to an assumption that people with high IQs are bound to accomplish a lot in life. Psychologists Jack Hayer and Peter Salovey introduced the concept of emotional intelligence, or EI, in the early 1990s. According to them, emotional intelligence is a person"s ability to understand his own emotion and those of others, and to act appropriately using these emotions. On a personal level, EQ includes having motivation and pursuing a goal successfully.It is generally accepted that the foundation for emotional intelligence is built in early childhood and emotional intelligence can be taught and developed. Therefore, no matter what one"s innate ability is, he can learn the skills such as making friends, being a good parent and getting along with coworkers. There is no big difference between men and women on total EQ, but usually men tend to be better at stress tolerance and women tend to be better at empathy and interpersonal relationship.Intellectual intelligence offers virtually no preparation for the problems one can face in the middle of his life. Even though people already know that a high IQ is no guarantee of success, they get used to paying more attention to intellectual intelligence not emotional intelligence. Having a high IQ, that is having a good memory, does not necessarily mean the person is capable of dealing with emotions. There are people who lack the social skills associated with high emotional intelligence, even though they are very intelligent. IQ is just the indicator of school achievement and educational success.Low emotional intelligence, however, can affect intellectual capabilities. For example, depression exerts influence on one"s memory and concentration. Psychological tests have proven that feelings of rejection can dramatically reduce IQ, resulting in aggressiveness and being out of self-control. Having a high IQ alone does not mean that a person will reach his potential.Moderate to substantial genetic influence on IQ has also been found through many studies and it is widely recognized that not all individuals are endowed with the same intelligence, but it should not be ignored that genes interact with the environment. Social factors will surely add to intelligence. One"s success is often decided by three factors—experience and training, IQ, and EQ—among which IQ is the least important factor and EQ plays a major role. Especially leadership success is found to be attributable to emotional intelligence. Fortunately while IQ is fixed and static, EQ can be developed and improved throughout life by training, heightening, and expanding emotional sensitivity and self-awareness.