Those who know me will not be at all surprised to learn the first thing I did once there was agreement to use self-selection as the approach to forming teams for the A&I Agile Release Train was buy and read +Sandy Mamoli's book Creating Great Teams: How Self-Selection Lets People Excel. I had heard Sandy talk on the topic some time back and my colleague +Mark Richards had previously used the technique with +Andy Kelk at Australia Post, so I wasn't walking in blind. My experiences with watching people bastardising SAFe made me want try and stick as closely to Sandy's guidance as possible. Specifically we chose to keep the number of constraints placed on the teams to the absolute minimum. In hindsight, I may have been a little naive on this front, but more on that later.