Over the past ten years, I worked with over a hundred development teams and they all had one common characteristic: they typically didn’t use pair programming as a technique to deliver software. Some teams talked about pair programming and liked the idea of it, but for some reason(s) they still didn’t pair. This raises the question so why won’t they pair? In my experience there are many obstacles to pair programming and collaboration. Many teams cooperate very well but don’t actually collaborate. Collaboration is a key aspect of pair programming, as it trust.