Google’s Project Aristotle:

The researchers also discovered which variables were not significantly connected with team effectiveness at Google:

• Colocation of teammates (sitting together in the same office)
• Consensus-driven decision making
• Extroversion of team members
• Individual performance of team members
• Workload size
• Seniority
• Team size
• Tenure

The researchers also found that what really mattered was less about who is on the team, and more about how the team worked together.