Google: Project Aristotle and Psychological Safety

Google studied roughly 180 of its own teams to answer a simple question: what makes some great and others mediocre? The researchers expected the answer to be talent density. Put brilliant people together and stand back. The data said something else entirely, and it landed hard in a place where elite individual performance was treated as the only unit that mattered.

For anyone who leads people, this is the case that reframes what you are actually managing when you manage a team. It sharpens the decision of how you respond to bad news, wrong answers, and dissent, because that response sets a climate you may not realize you control. The single biggest predictor of team performance, and the concrete leader behaviors that build or break it, are what the app reveals.