“What if those teams had created a better work environment? What if they had built a climate of openness where people felt able to speak up? What if that environment made it easier to be open and honest about error? To err is human. Mistakes happen—the only real question is whether we catch, admit, and correct them. Maybe the good teams, I suddenly thought, don’t make more mistakes, maybe they report more. They swim upstream against the widely held view of error as indicative of incompetence, which leads people everywhere to suppress acknowledging (or to deny responsibility for) mistakes. This discourages the systematic analysis of mistakes that allows us to learn from them. This insight eventually led me to the discovery of psychological safety, and why it matters in today’s world.”