The pairing session as the atomic unit of work

We have an extreme programming team at a small company dedicated to the agile approach. Our team of 7 developers decided to use the pairing session as the fundamental unit of work for all organizing, planning, estimating, tracking, and of course, pair programming. It´s been a great way to structure the day, provide rhythm and facilitate partner swaps. Estimating and tracking in pairing sessions provides us concrete feedback for improving estimates. This approach constitutes a hybrid between real time and abstract-unit estimating, resulting in highly effective planning and an extremely stable velocity. We have been working this way for about a year and have been exceptionally pleased with the results