Engagement begins with psychological safety. The brain is constantly scanning the environment to determine whether it is safe or threatening. When people feel safe, they collaborate, manage ambiguity, and remain engaged. When safety is reduced, thinking narrows and momentum slows. Michael Bungay Stanier’s TERA framework—tribe, expectation, rank, and autonomy—explains how leaders shape safety. By increasing the TERA quotient, leaders can build trust and sustain engagement.