Since ancient times, humans have sought to predict the future, often looking to signs in nature, such as the flight of birds. In modern business, reality is seen as something that can and should be measured and understood through rational methods and models. Such knowledge is seen as essential, enabling people to anticipate events, foresee risks and opportunities, reduce uncertainty. Though, unpredictability has to do with the contingent nature of things and with the relationship between the chaos of the world and the human need to control and order it. Philosophy has long questioned the concepts of chance and necessity.