When a team reaches this level they are producing excellent results and capable of delivering exceptional outcomes. It is quite are rare situation and yet this should be your goal when striving to become a brilliant leader. Team members are not only competent in their own roles but they have also developed some awareness of each other's role via cross training and ongoing knowledge sharing. There is a high level of trust and loyalty among team members. Your challenge when the team gets to this stage is to maintain motivation and high performance levels by stretching them, encouraging them to innovate and continuously improve existing processes.
Great things must always come to an end. For various reasons teams will eventually change. This could be through staff turnover, promotion of high performing team members or new joining team because of growth. This change of team dynamic will disruption the team will need to revert back to either the forming of storming stage before it can move forward again.
Tip : When you have high performing team your team members will be in demand. Don't hold them back. It is better to create career opportunities for them in your own organization rather then losing them altogether. If you are seen as a leader who runs high performance teams and helps people develop their careers there will be no shortage of people wanting to join your team and no shortage of career opportunities.