it's usually not good just to rely on one ranking (especially one based overseas when the majority of schools you are considering are American).
US News is probably the most widely used ranking source for most colleges and grad schools. Apart from that, business week, forbes, WSJ, etc. all publish rankings, so it would be a good idea to look at at least a couple of these rankings and compare them to our subclusters:
Columbia, Sloan (MIT), Kellogg (Northwestern), Booth (Chicago)
Stern (NYU), Darden (VA), Tuck (Dartmouth), Duke (Fuqua), Yale SOM, Haas (Berkeley), Ross (Mich), Johnson (Cornell)
US News Top 15
BW top 15
Top Ranked U.S.
1 University of Chicago (Booth)
2 Harvard University
3 Northwestern University (Kellogg)
4 University of Pennsylvania (Wharton)
5 University of Michigan (Ross)
6 Stanford University
7 Columbia University
8 Duke University (Fuqua)
9 Massachusetts Institute of Technology (Sloan)
10 University of California - Berkeley (Haas)
11 Cornell University (Johnson)
12 Dartmouth College (Tuck)
13 New York University (Stern)
14 University of California - Los Angeles (Anderson)
15 Indiana University (Kelley)
first point of contention was that Columbia should not be ultra elite. The rankings above don't seem to agree with this point of view.
Second one was that other schools, like Tuck, should move up. If it did move up, which school would come down? Probably none of H/S/W. CBS we just reaffirmed should stay there. Booth is in the top 7 of the three lists above. Kellogg is slightly low on Forbes, but high on the others. Sloan would be one guess.. they are ranked pretty low on both BW and Forbes.
I think if we were to look at a few more rankings, we could get a clearer look. For now, I think the subclusters should remain where they are. Maybe next year we can take a look at 4 US lists and a few international ones, and re-examine the listings.