Is a multidisicplinary enhancement project one that involves multiple departments?

The Multidisciplinary distinction is definitely departmental. The idea is that two different units are both participating in, invested in and being enhanced by the proposal. One of the departments receiving an equal or greater share of the enhancement must from an eligible discipline. Proposals are not multidisciplinary because the academic work touches on themes outside of the PI’s normal discipline. As in, a Business proposal is not also Computer Science because they are working with computers, or also Mathematics because they are doing some high level statistics work. They are only multidisciplinary if they are actually working with a Computer Science Department or Mathematics Department, and those departments are invested in the project and receiving tangible enhancement.