It's after midnight and I'm resting after a long vacation day with the family. What am I thinking about? Scrum, naturally.What I'm thinking about is this: Why don't Agile practices work on some teams? Why do some teams pick up Agile and run with it, and others either fail to pick it up or actively fight against it?It's taken me about two years to come up with the words to summarize my conclusion, which is stated in the introduction to many books on Agile and Scrum: Agile practices are what great ......