Well, Industrial Engineering is a pretty interdisciplinary field. You have to know many things on many fields such as Informatics (database systems and programming languages), Economics(cost accounting), Statistics(hypothesis testing and sampling ), Logistics (Operations, Operations Research) and many other fields.
However there is a unified framework, a kind of summary for industrial engineering that is supply chain study. There you find every field that I mentioned before and the related applications. But an industrial engineer is a valid employee also in the services sector (third sector) such as banks.
I have to say that one of the frequent problems (or advantages depending on your point of view) with I.E is that their knowledge is "inch deep and mile width" so they know a lot of things but just a little of every thing. So I believe (from an advantages point of view) that an i.e is the right man for team leading tasks and/or as a project coordinator .
