<p>To me, fit is subjective, diversity is objective.</p>
<p>I think of "rightness of fit" as something even a parent will notice; when the kid feels emotionally comfortable walking the campus and you don't feel like you need to escort him/her (hereafter just "him" for style's sake) after the tour is over b/c there's a confidence to explore solo. When your child/prospective student disappears from under your wing and you meet up a few hours later, he has had some conversations with other students that resonated and there's a sense "I could belong here."
Or, he returns all aglow about the labs, facilities or whatever else floats the boat and speaks much faster and more than you've ever heard in months about how much he "could" learn here. Honestly I think kids feel the fit at a subconscious level, at the tissue level, if it's there. </p>
<p>Diversity is something the college watches out for, trying to ensure as much of our nation's broad sweep of peoples as it can shoehorn into its class, using every imaginable carrot. In a way, it's the college's task to develop diversity in the class, but it will enrich and equip all the students to work in the 21st century. Since you can't change your race or income background, it's out of your control for admissions, so just go and enjoy the diversity that the college has managed to collect. That's how I look at it. </p>
<p>To help the OP;s head stop spinning, I'd suggest: You can't make yourself be more "diverse" so just be. If it's meaningful to your child's persona, for example has been in a youth culture group or has pursued activities that show he/she has sought out diversity already as a high school student, then describe those in an essay. They indicate an openness to diversity and that this child might help make bridges and not stay Balkanized in his own comfort zone. </p>
<p>In terms of fit, have the kid ask himself (even if it's not a formal essay question), "Why College X?" and see if the reasons that tumble out of his mouth seem to match what the college promotes the most. If he says he likes the college because he "wants" a friendly community of learners, but the college website and AdComs speak a lot about "this college requires independent, risk-taking, organized students who know how to use the resources of this great university..." maybe it's not as nurturing as the kid needs to feel comfortable enough to learn optimally. OR, if the kid says he likes the place because it has a "great" department (measured by the building or the one course he sat in on), but later you see the catalogue has only 2 courses and one isn't taught this year, or the professor he sat in on is just an adjunct professor who wouldn't have office hours, then perhaps the academic offering won't be large enough for him and he'll outgrow the place.
I wouldn't say to replicate the h.s. culture, either. Just because a kid has grown up in a suburb doesn't mean he can only feel okay in a school in a suburb. Some rural colleges have so much going on (since people come from afar and stay on campus) that they recreate more activity on campus than some small cities each weekend, and it's free and easily accessible. A city kid could "fit" in a rural environment as long as a part of him dreams he'd like to spend some years of his life able to see the starry night sky. In other words, fit can be a new style environment that seems to match where the kid wants to explore next in his life. My eldest grew up rural so he "only" wanted a suburban or urban setting for college. He didn't want to "fit" into the cute Main Street of a college town, since he was sick of the one-block-long Main Street of home. His younger sister, however, really brightened to see a small-town rural setting because she felt so comfortable and wanted to apply her attention to exploring the campus resources, not a bustling nearby city. It's very personal; no generalities.</p>