One of my favourite interview questions to ask is, what version control systems have you used. I always ask what the applicants favourite editor is. Not becaus

One of my favourite interview questions to ask is, what version control systems have you used. I always ask what the applicants favourite editor is. Not because they have to use The One True Editor, but because they definitely should have one they prefer (which implies "know"). Craftsmanship warrants knowing your tools.