Heather -
Answers to your questions, as well as links to the NPC sorority nationa websites (for research) can be found on my Sorority Recruitment FAQ page. This page has been reviewed by an officer of the NPC, so it's pretty accurate.
http://panhellenic.tripod.com/FAQ.html
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Fraternally,
Barbara
Zeta Tau Alpha Alumna
If you have to go around telling everyone you're in charge you're not much of a leader.