• Lead Time : Length of time between when the code is committed and when it is deployed to production. Smaller is better.
• Mean Time to Recover : Length of time from incident start to incident end. Smaller is better.
• Change Failure Rate : Number of deployments to production that need hotfixes. Smaller is better.
• Deployment Frequency : Number of times new code (not hotfixes) is deployed to production. Larger is better.

Improving these metrics directly results in huge performance boosts for developer productivity.

• The First Ideal : Locality and Simplicity. Build simple, decoupled systems that can iterate in isolation.
• The Second Ideal : Focus, Flow and Joy. Work in small batches with fast and continuous feedback.
• The Third Ideal : Improvement of Daily Work. Make sure that daily work can be done with minimum impediments. Prioritize productivity over everything else.
• The Fourth Ideal : Psychological Safety. Solving problems requires preventing problems, which requires honesty, which requires the absence of fear.
• The Fifth Ideal : Customer Focus. Build only that which actually matters to our customers.