Another useful information is the way, in which World of Tanks selects players to the team. Beginner tankers playing with their friends often complain that their vehicle is not able to damage enemy machines, because they are too high tier. Usually the guilty one is game built-in matchmaking system, which selects players to opposing teams. Within this mechanism each tank in the game has so called battle tier: for example for the heavy tank PzKpfw VI Tiger it is 7-9. That means that it can encounter only opponents with same battle tier. The weakest opponents we encounter in this way will be medium 5 tier tanks (KV-1, Pzkpwf IV) and the strongest - 9 tier tanks (E-75 or IS-8). Problem appears when we want to play with friend in a weak tank: in this case battle tier of our platoon will be the same as the highest battle tier within grouped tanks.
Usually tanks are able to fight with opponents of +-2 levels (as in the above example with PzKpfw VI Tiger). However some vehicles have a much wider range of battle tiers available for them: both artillery and light tanks often encounter opponents of 4 levels higher. This is mainly because of their usability in fights of stronger vehicles, because even low tier light tank can carry out an effective scouting and low tier artillery is able to critically damage a heavy tank.