High Quality Content by WIKIPEDIA articles! Game theory is a branch of applied mathematics that is used to mathematically analyze behavior in strategic situations, in which an individual's success in making choices depends on the situation and the choices of others. While initially developed to analyze economic decisions and competitions in which one individual does better at another's expense (zero sum games), it has been expanded to treat a wide class of interactions, which are classified according to several criteria. Today, game theory is used in many fields, including economics, biology, engineering, political science, military science, international relations, computer science (mainly for artificial intelligence), and philosophy, and the social sciences, where 'social' is interpreted broadly, to include human as well as non-human players (computers, animals, plants)" (Aumann 1987).