Since the time game theory came into its own with the publication of Von Neumann and Morgenstern classic, and the solution to Zero Sum Games (ZSG) of the maxi-min theorem, attempts have been made to analyze non- zero sum games with the same rigor, with not as much success. Classification have been made, qualitatively on NZSGs, however they provide little in the way of aiding in solving the difficulties one encounters in those games when approached from a quantitative approach. These approaches have been hampered by the lack of methods to analyze the games and are in dire need of new directions for exploration.
Eisenhauer, William D., "Quantitative Non-Zero Sum Game Classification via Informationtheoretic Reconstructabilty: A Preliminary Research Proposal Exploration" (2003). Engineering and Technology Management Student Projects. 1564.