Internal, external, and transfer applicants are interviewed. Not sure how it works at other companies, but Walmart's "career preference" system is ingenious allowing associates to express interest in any position in the company that they are qualified for, see pay, and other factors, then when a position comes open they are automatically submitted for an interview

The initial interview is a one on one basic interview. They have a hiring packet that they use and read you one of two questions for 5 sections. They are questions like "Describe a time when you used good judgment in handling a difficult situation...What were the circumstances? What policies or procedures did you use to make your decision? What was the outcome? The second Interview was a panel interview where they asked you more questions like that in front of 3 or 4 people of management.