HR initially emails with link to online assessment to take, which is quite similar to the IR portion of the GMAT (reading and interpreting information from charts/graphs). If you succeed on that, next step is phone interview with a manager in the department. The manager also has a business case quiz over the phone to begin the interview (which is a simple scenario based on inventory and processes at a fictional store), followed by a few behavioral type questions. The manager I spoke with was not in HR, and so wasn't a very strong interviewer. The questions were run-of-the-mill.