In 2005, Microsoft’s DevDiv (with 2000 participants and 40 million lines of code) overhauled its engineering practices to improve agility, quality, and customer satisfaction. Four years into the journey, customer satisfaction has increased dramatically. Product quality improved 10x. Velocity improved 2x, with schedule time for major releases was cut by eighteen months and quarterly releases of “power tools” allowed incremental delivery to external customers. Practices that change include planning, org, quality gates, branching, testing, tooling, reporting, backlogs, transparency.