Pair Programming is an Extreme Programming (XP) practice where two developers collaborate on the same code on one workstation. In this blog post, Yan Pritzker provides an experience report after his first nine months of pair programming. On the positive side of pair programming, he lists quick knowledge transfer, improved productivity and higher quality code. The disadvantage of this practice are a tired voices, difficulty to research and learn, need for space for creative activities, longer time spent on trivial tasks, possible issues with sharing the same configuration for the development environment. His conclusion is that “pairing coupled with an extremely pragmatic approach to knowing when not to pair is the key to success.”