The other stage of development that determines the behaviour of an individual is the ego. Ego deals with reality. A normal person possesses this developmental stage as they work in a way of ensuring that the needs of an Id are expressed in a more acceptable way. The behaviour is controlled by the principle of reality hence its reasoning are more realistic and socially acceptable since the impacts and the cost of actions are put into consideration before a decision is reached negative by the society. The superego on the other hand is responsible for the inner morality and ideas that are got from the environment, having the sense of what is right, and what is wrong. Superego guides the sense of judgement. It will drive behaviour to the right path of ideal and good behaviours, obeying rules and thus accomplishing the results of pride and value. It is also controlled by conscience that holds information on the things that are considered negative by the society. The three developmental stages explained by Freud will therefore determine personality and behaviour of an individual. Erickson and Jung, demonstrated the behaviour development and differences on the stages of psychosocial development. Their works was largely influenced by Freud as they stated that the human personality also develops in stages and are influenced by the social life at all levels of life. In the development of behaviour, culture and the social environment have a major influence on the development of ego identity.