Nobody has done more research on this than the US Military, specifically the special operations community.
The key takeaways that you find in very effective SOF teams are:
1. Clear and accepted authority chain (Top guy earned their place at the top)
2. Candid and constant communication/feedback between all members
3. A clearly defined, proven effective and specialized role for every member with each member knowing how each others role plays together
4. Common sense of purpose (Objective etc...)
5. Common experience (BUD/s, Q, FTC etc...)
If you have all of those then pretty much everything else falls into place. Note also that this has no requirement for everyone to being an "A" personality or whatever and has basically no bearing on what they do outside of work. Those aspects can help, but they can equally hurt depending on the egos involved.
The key takeaways that you find in very effective SOF teams are:
1. Clear and accepted authority chain (Top guy earned their place at the top)
2. Candid and constant communication/feedback between all members
3. A clearly defined, proven effective and specialized role for every member with each member knowing how each others role plays together
4. Common sense of purpose (Objective etc...)
5. Common experience (BUD/s, Q, FTC etc...)
If you have all of those then pretty much everything else falls into place. Note also that this has no requirement for everyone to being an "A" personality or whatever and has basically no bearing on what they do outside of work. Those aspects can help, but they can equally hurt depending on the egos involved.