<p>OP, if you are interested in OR, then out of those three, Northwestern is the only school that offers a major in that field. OR is pretty much the same thing as IE.<br>
[Operations</a> research - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Operations_research]Operations”>Operations research - Wikipedia)</p>
<p>The concentration at CMU is not OR, as far as I know; it’s called “production and operation management” and is one of the concentrations for the undergrad business major. It’s far from the same thing as OR and whatever it is, it’s at a superficial level (as just about any undergrad business curriculum is). </p>
<p>By the way, the IEMS at Northwestern is ranked #5 in the nation. I think NU is the clear choice here.</p>