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The Castrol Performance Index is a ranking system created by Castrol for men's club association football as part of a sponsorship package with FIFA. The system uses mathematical formulas which evaluate various player performance in terms of how individual actions either assist or prevent goals. The system takes into account the strength of the opposition and the time in a game the player's actions occurred. Castrol publish several rankings: players in top five Euporean leagues monthly during a season, MLS player ranking and international tournament rankings. Castrol became the official oil lubricant of FIFA in 2008. It published a ranking in UEFA Euro 2008. It was an official sponsor the 2010 FIFA World Cup in South Africa and an index measuring World Cup player performance was updated after each round of matches.〔(【引用サイトリンク】title=Castrol joins forces with FIFA World Cup until 2014 )〕 Castrol made a ranking in UEFA Euro 2012〔UEFA.com: (Full ranking ).〕 and 2013 FIFA Confederations Cup.〔FIFA.com: (Castrol Index Ranking )〕 ==Castrol Index Ranking== The Castrol Index is a rolling ranking system that measures performance of every football player across Europe's top five leagues during the course of a 12-month period. Rankings are published monthly. To get Castrol Index Ranking, first "Castrol Index Score" is calculated for every player in every league and Champions league match, then the score weighted to get "Castrol Ranking points", and lastly, cumulative points from every match during the 12-month period are multiplied with 90 and divided by total minutes played.〔(【引用サイトリンク】title=Castrol EDGE Rankings FAQ )〕 Weightings are different in every league and are adjusted after every season by strength of every league. For example, Champions league knock-out stage has biggest weight.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Castrol Performance Index」の詳細全文を読む スポンサード リンク
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