As it stands now, NPC and the collegiate panhellenics do not hold sway over any member sorority’s membership criteria or who they select for membership.

So (to pick a large sorority), Delta Delta Delta could go fully co-ed (allowing all undergraduate students) without putting its NPC membership in automatic jeopardy?

(I know the NIC has at least one member (don't remember which) that has some co-ed chapters) I don't know for other GLO umbrella groups.

They could go fully coed but if they did that, they most likely wouldn't participate in all of formal rush. Then again, to be blunt, men aren't usually trying to get into women's groups, it's the other way around.

The NIC and NPC are so different in what they do as umbrellas there really isn't a comparison. Also the reason some fraternities went coed (by chapter or in toto) was because the majority of the schools they were at went from all male to coed.

Oh and in answer to Lane's question I think that the campuses KBG does do formal rush at are the less traditional ones with smaller systems.

KBG participates in recruitment at Wake Forest.

So, theoretically, NPC wouldn’t be able to tell the STEM organizations not to only select STEM members…but I couldn’t imagine them meeting quota with only STEM at larger schools. I guess that’s what I was getting at.

(Although I’m quite impressed with- in terms of non-NPC organizations- how large some of the chapters are at many campuses! They’re doing really well in their own right. For example, I know someone whose daughter is considering Syracuse for a STEM major. The AOE chapter gets PCs between 20-30, whereas NPC total is 215…I am pretty sure their quota is much higher than, say, 25, but I don’t have time to find actual numbers RN.)

Differences in size is more likely to splinter NPC.

The eight sororities that became full NPC members in 1951 were smaller in chapter number and initiate number, on and since that date, than the other established NPC groups.

I wish I understood what those eight smaller sororities looked forward to by joining forces with the larger groups, and how those desires were and were not fulfilled through the years.

When I look at Indiana University's most recent NPC expansions, the need for additional groups was there but having all the new groups meet quota and/or have permanent housing has been a struggle.

Is it a significant gap? I picked a prior to 1951 NPC sorority that I wasn't familiar with and a 1951 NPC full sorority I sort of was and at least looking at wikipedia, the gap doesn't look huge.

According to Wikipedia.
Sigma Kappa - (Founded 1874 - joined NPC in 1905) - 119 undergraduate chapters 226K lifetime members.
Delta Phi Epsilon - (Founded 1913 - Joined NPC in 1951) - 150+ chapters, 115 active chapters, 60K Lifetime members.

Now I know Wikipedia may be reporting different things (and I'd love an NPC report I could work from to be sure the comparison is apples to apples).