Culture
A lot of DevOps relies on soft skills, or the culture and environment in which people work. Cross-functional collaboration is an important piece of DevOps culture.
Automation
Build, test, and deploy production-ready code as quickly and easily as possible. Nothing makes that process go faster than automation. Continuous integration and delivery.
Lean
Continuous improvement (failing fast and learning from mistakes). This applies to improving how teams work together, as well as listening to customers.
Measurement
How do you know that they're improving how your team works? In DevOps, it's important to track internal metrics.
Sharing
Sharing goals, successes, failures, and responsibility goes a long way toward bridging the divide between development and operation teams.

Guiding Concepts