It's hard to believe ... but ...
... things changes, so <<There are no a priori best practices>>
Agile Manifesto ++
Last week i joined a class with Mike Cohn to become certified scrum master. Although I've been practicing agility in an agile team since 5 years many concepts sounded interesting and revolutionary to me. Also in a such young subject like agility there are so many different interpretations and opinions that sometimes is good to go to the origin. Mike Cohn is not an author of the agile manifesto but in my opinion is definitely one of the "original sources" of agility due to his long and various experience.
Mike divided us in groups and asked every group to add a fifth...