A standard instancing team usually consists of following characters:
Tank, who are supposed to attract the entire activated demon's hatred so as to supervise them orderly, and then render the adventure more smooth. Usually the main tank is endued with the complete mastery of the operation of Rupture, Demoralizing, Thunderbolt, Amour penetration, Taunt.
Healer—they are required to keep the whole team in safe operation, healing and resurrection as the main responsibility. When there are two or more healers in the team, you are supposed to choose one main healer. The holy priest enjoys the top priority and then comes to Druid.
Main Assist: usually the rogues will take the responsibility to act as a main assist. They will collect all the damages so as to attack the enemies at one blow.
Damage Dealer: except the Tank, Healer, and Main assist, all the remaining ones are damage dealers. They are required to help the Main assist to annihilate all the enemies.
Therefore, every teams are committed themselves to maximize the battle situation in which Tank will attract the entire activated demon's hatred, all Damage Dealers will assist Main assist to kill off enemies, and healers will in charge of the security all the time.
And I will clear some misunderstandings about the instancing teams.
Tank is not omnipotent. Therefore forsake the misunderstanding that warriors will attract numerous mobs with the help of priests. When encountered with warriors, the upper limit of the elite demons will be no more than 3.
Healer: the qualified healer should possess one list of preference as for who will enjoy the prior healing. Usually the pets will be disregarded since Healers can use their bandages and healing for pets. So Healers should look at the big picture, even at the expense of their pets.
Main Assist: when the Main Assist has been chosen, you should help him actively. Damage Dealer will share the same position in the team with others.

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