I think the best solution is to ask the questions in as many possible ways you can think of. Some people are great at coding, but suck at whiteboard, others ar

I think the best solution is to ask the questions in as many possible ways you can think of. Some people are great at coding, but suck at whiteboard, others aren't comfortable talking about their thought process. So why not give them numerous ways to show their stuff? Have them find bugs, have them code on whiteboard, have them write code in a compiler, etc etc. Your goal is to find a good programmer, not a programmer who is good at white board.