The interview process was long, consisting of a telephone interview then a face-to-face group assessment.
After an introduction and a few stories by current employees, we were broken into 3 smaller groups to solve a problem. An assessor was in the room the whole time. I think this section was to determine how you would work in a group setting.
Next was 3 or 4 mini interviews that were somewhat intimidating. They were timed, and you were very conscious of the candidate before you who was already in the room as well as the candidate behind you waiting to enter the room.
Overall, ING managed the process well but I found it highly intimidating and competitive which I don't believe always brings out the best in people.