the freedom to say 'I screwed up' out loud without updating your resume that night.
means a shared belief that a team won't punish, humiliate, or ignore you for speaking up, admitting error, or asking a dumb question.
from coined by harvard's amy edmondson in 1999, who found that better-performing hospital teams actually reported MORE errors — not because they made more mistakes, but because they felt safe enough to admit them.
google project aristotle — studied 180 teams, found psych safety beat talent or tenure
pixar braintrust — brutal story critiques work because no one loses status for a bad draft
nasa post-challenger reforms — engineers empowered to halt launches after 1986 disaster
edmondson's hospital study — nurses on better units admitted more medication errors, not fewer