Matthias Marschall (in 2011) – The three essentials of any agile process:

“By making progress (and bottlenecks) visible, helping people focus, and pulling together as a team, everyone starts to be proud of what they’re doing. Suddenly, they want to be responsible for the whole story (not just an implementation detail). They start to take pride in delivering perfectly working features. Congratulations, you’ve reached the ultimate goal of agile: Your team takes ownership!”