Some people have a very narrow experience, but within that experience, they can actually be pretty darn good programmers. I worked with a bunch, none of whom e

Some people have a very narrow experience, but within that experience, they can actually be pretty darn good programmers. I worked with a bunch, none of whom ever ventured outside of Visual C++ and SQL, and who would never have even heard of Ruby or Python or Clojure. Despite this, they could still knock out pretty decent real-World code. In that case, it can be difficult to filter out the bad ones, just based on general conversations, without asking people to actually code on a blank board.