The EF English Proficiency Index (EF EPI) is a report which attempts to rank countries by the average level of English skills amongst adults. It is the product of EF Education First, a global language training company, and draws its conclusions from data collected via English tests available for free over the internet. The report was published for the first time in March, 2011 based on the results of over 2 million test takers. The most recent, fifth edition was released in November, 2015.