I found something interesting while surfing the other day - apparently, the bid/matching system that NPC sororities use is the same one as is used when matching prospective residents to med schools, and that it's as fair as possible, given the number of residents (women) being matched to schools (houses). The link was for a study that analyzed the matching process, to figure out if it was really fair or not.
If I find that link, I'll post it.
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Alpha Sigma Kappa - Women in Technical Studies