From the article:
"I’ve commandeered the column this week in Dana’s absence (you poor souls). Dana discussed many reasons people play MMOs, but I’m going to talk about the aspect of great MMOs that really keep people keep playing: Raiding. Raiding is the process of going through usually lengthy dungeons and defeating all the bosses therein. Raiding takes a large number of people (10 and 25 in World of Warcraft) and the items that the bosses drop get divided using some system that the group has agreed upon beforehand. Specifically, I’m going to focus on the positive things one can learn from being in a semi-serious, competitive raiding guild. I am not proposing that these are things you can only learn in such an environment, but these are things that I picked up or think someone could learn."