Agile Champions Teams (ACT), a team of 16 or so individuals participate on the ACT on the team for around 6 to 24 months depending on their role and ability to commit time to the team. Members are chosen to equally represent all functions involved. ACT meets every other week for 2 hours and augments those meetings with occasional longer offsite meetings.
ACT resolved issues related to lack of stakeholder involvement in projects, the proper use and meaning of deadlines, and executive leadership misperceptions of what agile is and can do for the company. One of the developer from the ACT team expressed his views that the best things to come out of ACT is the wide-open, smackdown brown bag sessions where all are welcome to ask questions and share knowledge. These meetings helps uncover root challenges in agile, which could be addressed by ACT.
Book: SUCCEEDING WITH AGILE Software Development Using Scrum by Mike Cohn