<p>Stanford’s managemnt sciences and engineering department used to be called IEOR. The shift is probably due to the diminishing role of manufacturing/merchandizing companies. MS, OR, and IE are used interchangeably for many people while for other people/schools, there’s a slight difference in emphasis (with MS being more about business management). Look at the curriculum and the required core/concentration electives and compare.</p>
<p>You can easily switch to engineering school from WCAS. There’s also a 4-yr dual-major already set up between econ and IEMS at Northwestern. You can also easily double-major in math and IEMS though it may take some extra effort to finish in 4 years.</p>