What makes an effective team?

[monnaf]

1. It has a range of individuals who contribute in different ways (see the roles above) and complement each other. A team made up just of planners would find it difficult to cope with changing deadlines or plans whereas a team full of spontaneous individuals would be disorganised: you need both types. A good team produces more than the individual contributions of members.
Clear goals are agreed on that everyone understands and is committed to.
2. Everyone understands the tasks they have to do and helps each other. Picture of interviewee
3. It has a coordinator who may adopt a leadership style from autocratic to democratic depending on the circumstances. Different people may assume the role of leader for different tasks.
4. There is a balance between the task (what do we need to do?) and the process (how do we achieve this?)
5. There is a supportive, informal atmosphere where members feel able to take risks and say what they think.
6. The group is comfortable with disagreement and can successfully overcome differences in opinion.
7. There is a lot of discussion in which everyone participates. Group members listen to each other and everyone's ideas are heard.
8. Members feel free to criticise and say what they think but this is done in a positive, constructive manner.
9. The group learns from experience: reviewing and improving performance in the light of both successes and failures.

https://www.kent.ac.uk/careers/sk/teamwork.htm