I'm still learning the ins and outs of expansion, but I know my school is expanding in September (adding one sorority, and maybe one more in 2005), and Pi Kappa Alpha just colonized here in 2003. I guess what I don't understand is why/how the decision to expand is made, especially when there are a couple of groups who are consistently under quota.
Ah, stupid newbie questions. Gotta love 'em!