as the team learns modern engineering practices that reduce dependencies, the Product Owner gains the ability to priorities by business value rather than technical efficiency.

business people and developers must work together daily throughout the project.

a well-formed PBI is customer-centric, so the business value is clear

if we can’t agree on a rough estimate for a PBI, it’s a clue we don’t understand it yet

a single PBI should be no bigger than a quarter of the team effort for one Sprint. Ideally, the PBI should be even smaller than that, such as one or two team days

each item should have a clear, bright finish line agreed between the Team and PO.