One team hired an agile coach to help them transition to a new way of working. The coach helped the team focus on work rather than individuals and asked questions to uncover blockers or ways to help the team work faster. As an external coach, they did not stay with the team long-term. The document recommends that teams work with a coach for at least 3 months and appoint an internal team coach to continue growing the team's knowledge of agile practices after the initial external coach leaves.