The first step is usually HR interaction, some common questions like your current job, salary, location, why do you want a new job, then go deeper to ask about your experience, competency and experise for this position. There could be a suject matter expert on line as well to check whether or you are at least qualified for next round. It would much more difficult for next round usually conducted by direct manager. There are some detailed questions: what's your understanding of business process improvement, what is standard deviation, what is variation, what is control chart, what steps you need for a root cause analysis, what is most prevalent data analysis method etc. This round is the most important one and it would be much easier next round around 'cause this is going to arrive at senior level manager who pretty much has an idea what you got based on last round feedback. DELL interview is typically a compentence-based interview. That means your past success story would be important to prove you're capable to do this next job.