Northrop Grumman Program Cost Control Analyst interview questions

Submitted application with Resume on line and was contacted by an HR Representative to schedule an interview. My experience with the HR Rep was horrible. They did not return my phone calls in a timely mannor and were unclear with some of the requirements. When I came in for my interview, I had to wait for 20 minutes before I was seen. I interviewed with 4 people total, each person for half an hour.