The FIFA Worl Rankings is a ranking system for men's national teams in Association football, currently led by Argentina. The teams of the member nations of FIFA (Fédération Internationale de Football Association), football's world governing body, are ranked based on their game results with the most successful teams being ranked highest. A point system is used, with points being awarded based on the results of FIFA-recognized international matches. Under the existing system, rankings are based on a team's performance over the last four years, with more recent results and more significant matches being more heavily weighted to help reflect the current competitive state of a team. The ranking system was most recently revamped after the 2006 World Cup, with the first edition of the new series of rankings issued on July 12, 2006. The most significant change is that the rankings are now based on results over the previous four years instead of the previous eight years. The change is perceived to respond to criticisms that the rankings do not effectively reflect the relative strengths of the national teams. (See section Criticism).