There have been a number of questions lately about how ELO works in RIFT, so here is a brief rundown.ELO is a constantly adjusting rating based on a player's win/loss record in Warfronts. Every time you are on the winning side in a Warfront, your ELO goes up; every time you lose it goes down. The amount it goes up and down depends on the challenge your team faced. If a team's total ELO score was less than their opponents and they won then those winning underdogs would have their ELO score go up more than usual, and the losers would go down more than usual. However if the compared total ELO ratings expected one team to dominate, and they did dominate, then the final scores would be adjusted only slightly (the winners getting very little, and the losers losing very little).When the matchmaker is creating two teams for matches, it takes several factors to balance the two teams:• team sizes• relative total ELO rating• attempts to get the same number of healers• attempts to get the same number of DPS• if possible, have the same number of Pre-madesAfter studying the logs of hundreds of thousands of warfront outcomes, the biggest indicator in who was likely to win a match isn’t which side has the most healers, or DPS, or pre-mades... The most accurate predictor of which side will win was which side had the highest total participating ELO rating.One interesting thing that we noted was that participation is the most important factor in which side wins. Although the match maker can try to put together two teams with a relatively equal chance of winning, if someone doesn't show up to a match, or bails out, then that side is going to be handicapped until the matchmaker can try to find someone to take the place of the person who didn't participate.We used to have a slightly more complex "player rating" computation rather than standard ELO, but a flaw was discovered in the calculations last September that managed to affect two players, and so we threw out the extra bits and stuck with traditional ELO (wikipedia has a good article on it if you like math).