Because we're in an industry that has scarce resources, much of our growth is through promotion. My feeling is that people gravitate to what they enjoy, and it's pretty apparent when people either like being individual contributors or managing small groups or when they really want to have larger managerial roles. You can move up in the organization in either direction. I don't want people contorting to get a promotion. I don't want to put people in a position where they hate coming in to work.
Performance evaluations provide a formal way of doing it every year.
In terms of the interview, I look for people who think about the question I ask and answer it crisply. How crisply you answer and how much you hit the nail right on the head is a real plus. The manufacturing floor is the most structured. There are shifts, and so people have a structured lunchtime and break time. Sometimes there's a whiffle-ball game out back in the parking lot.