You will know you are at the optimum level of teamwork when everyone on the team
experiences the CEO of Teamwork': Challenge, Enjoyment and Opportunity. If you don't aim to provide these things, it's likely that your team members will find other employers and/or other managers who do.
Let's say you already have a good team in place. How do you know what to do to make a difference? A good starting point would be to ask yourself to what extent the work in your team offers the individual members challenge, enjoyment and opportunity.
If your reflection identifies any gaps, try asking the team how they think teamwork could be improved. If you use an anonymous survey with targeted questions, you will be surprised at how much useful information you'll gain. (Consider using a coach or consultant to do the survey for you.)
With each of these steps, once you have the information you need, the most important thing is to use it to develop an action plan that will lead you and the team closer to being a dream team'.