It's a lot like a resume - they want to know what girls were involved in, their GPA, achievements, etc. It helps them know a little more about a girl coming in than they would otherwise. At Mizzou (and schools like Bama, Texas Tech, etc) they're pretty much a necessity. Of course it's against NPC rules to make them required but in a sea of 2000 girls, if you're one of the few they don't have more info on you have less of a chance. Rush parties start at 15 minutes the first day and they have to get from 2000 girls to 85ish on bid day with only 3 rounds of cuts, so it helps to have more than that 15 minute convo to go off of.
Knowing that girls were involved in HS, have a history of doing a lot of service, etc is a really good thing that chapters are looking for and may not come up in conversation. It also, I guess, shows that they're invested in rushing and put in the effort to get recs so they're probably serious about joining Greek life (nobody wants to make quota and then have girls drop because they just rushed to see what it's like.)
I believe for some houses you can write out a letter of support along with a rec (maybe even my own I haven't checked out the form too much). A rec is mostly like a resume but a letter of support is for someone you know really well and want to go more in detail about their character, how great they are, etc and is an actual letter. My close friend's mom who is a DG did this for me.
It's definitely a little weird and it seems like they could just have everyone submit their resume with registration? But alas, this is the system we have.
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