What's the single most important quality that contributes to successful teams? Trust. Here is some great research from Google, who know a thing or two about teams and what makes them tick.
By the way, the answer might seem simple, but building trust is tough. You can't buy it, but you can earn it. Have a read and see how.
"In a team with high psychological safety, teammates feel safe to take risks around their team members. They feel confident that no one on the team will embarrass or punish anyone else for admitting a mistake, asking a question, or offering a new idea." In other words, great teams thrive on trust. This may appear to be a simple concept, but building trust between team members is no easy task. For example, a team of just five persons brings along varying viewpoints, working styles and ideas about how to get a job done.