Opposed to this trait theory of leadership, evolved a system of understanding called the behavioural theories of leadership. Behavioural theories of leadership are based upon the idea that great leaders are made, not born. Rooted in behaviourism, this leadership theory focuses on the actions of leaders, not on mental qualities or internal states. According to this theory, people can learn to become leaders through teaching and observation. Conditioning occurs through interaction with the environment. According to behaviourism, behaviour can be studied in a systematic and observable manner with no consideration of internal mental states. Behavioral theories of leadership do not seek inborn traits or capabilities. Rather, they look at what leaders actually do. If success can be defined in terms of describable actions, then it should be relatively easy for other people to act in the same way. This is easier to teach and learn then to adopt the more ephemeral traits or capabilities. Thus, Behavioral leadership is a big leap from Trait Theory, in that it assumes that leadership capability can be learned, rather than being inherent. This opens the floodgates to leadership development, as opposed to simple psychometric assessment that sorts those with leadership potential from those who will never have the chance. A behavioral theory is relatively easy to develop, as you simply assess both leadership success and the actions of leaders. With a large enough study, you can then correlate statistically significant behaviors with success.