The notion of psychological safety is an idea first developed in the 1950s that has been extended in important and careful ways in recent years, especially by Amy Edmondson of Harvard Business School. The core of the idea is that a context that is psychologically safe is one where people feel they won’t experience interpersonal harm — being ridiculed or otherwise personally attacked — if they try to speak up, make mistakes, take risks, or ask for help. There is a lot of very strong evidence that creativity, learning, and exploration are better where psychological safety is higher.