Fannie Mae took a balanced approach to delivering its services, establishing "guard rails" through its Agile Center of Excellence (COE) while allowing business units to own their own transformations. The COE provided training, coaching, standards and practices, and metrics reporting to guide transformations while empowering teams. It initially focused on adoption metrics and skills building, then maturity assessments and best practices. Over time it pivoted to focus on outcomes like time to market. This balanced approach helped Fannie Mae transition 215 teams to agile, with high employee satisfaction and customer satisfaction results.