Amazon Manager - Operations interview questions

Received phone calls to arrange phone interviews. Both phone interviews were based on Amazon's 14 principles of leadership values. Interviewers were very pleasant, encouraging, willing to listen but only moved on to the next question when they had a clear answer and understanding of what you said and the context in which it was said. Expect them to drill down for details to verify what you say. The face to face interview is challenging with 4 interviews of approx 45 minutes each and will include a competency test so expect to brush up on process flow equations. It's not only important to know your stuff but also to be able to quickly work with variances to the original problem (they will change the original question to check that you can recalculate accurately).