1- Environment: such as home, school, work, media, cultural background, religious background, tradition and beliefs, social environment, political environment.
Our behavior changes according to our experiences with people and events in our life. If we have a positive experience with a person, our attitude towards him becomes positive. If we have a negative experience with a person, our attitude towards him becomes negative too.
Both formal and informal education affects our attitude. It is useless if we are drowned in information because we have to have knowledge and wisdom besides as well. Education ought to teach us not only to make a living but also how to live.