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Use the whiteboard

When I have to interview people for jobs, I always ask them questions about systems they have worked on while we draw out the block diagram on a whiteboard: What are the major components? How does component A talk to component B? What happens if C fails? I’m trying to transfer their mental images of their software into my own mind, of course without either going mad or having a nasty flashback.

George V. Neville-Neil (Kode Vicious)