You know the meeting. Someone senior floats an idea that everyone in the room can see has a hole in it. Heads nod. The hole goes unmentioned. Three weeks and a lot of money later, the hole becomes a problem, and in the post-mortem four people say quietly that they "had a feeling about that one."
That meeting is expensive, and it has a name. The thing missing from the room is psychological safety.
Amy Edmondson, the Harvard professor who coined the term, defines it plainly: a shared belief that the team is safe for interpersonal risk-taking. Safe to ask the dumb question, admit you're lost, disagree with the boss, own a mistake, pitch the idea that might flop. Her research traces a clear chain: safety lets people do the risky learning behaviours - speaking up, asking for help, experimenting - and those behaviours are what actually lift performance.
When Google went looking for what made its best teams tick, it studied 180 of them for its Project Aristotle research. Not seniority, not raw intelligence, not who was in the room. The factor that stood out above the rest was psychological safety.
Here's the part managers get wrong: safety is not niceness. A team that's warm and conflict-free but coasting is in a comfort zone, not a high-performing one. Edmondson pairs safety with high standards and calls the overlap the learning zone - people feel secure enough to take on hard work and to be honest about where it's falling short. Safety without standards is a book club. Standards without safety is a place people quietly stop speaking up.
Safety is fragile. It builds slowly and breaks fast. One eye-roll when a junior asks a question, one "we don't have time for that right now" when someone raises a risk, one public dressing-down - and the room recalibrates. People are exquisitely good at reading whether it's safe to speak, and they'll go quiet at the first sign it isn't. The quiet costs you the exact information you needed.
Edmondson's work points at a short list of leader behaviours that do the heavy lifting. None of them are pep talks.
Notice these are habits, not values on a wall. You build safety in how you react in the small moments, over and over.
You can tell a team all of this in a slide deck. It won't move much. Safety isn't a concept people adopt; it's an experience they have and then want more of.
That's what a well-run improv session is: a safety gym. The whole art form runs on interpersonal risk - you step out with no script and have to trust that your teammates will back whatever you offer. So you practise the exact behaviours that build safety at work, with the real-world stakes turned right down. People own a flub and get a laugh instead of a wince. They back a colleague's strange idea and watch it turn into the best moment of the day. They feel, in their body, what a room feels like when it's safe to swing - and they take that reference point back to Monday.
I'll be honest about the ceiling: a single session won't repair a punitive culture, and it shouldn't pretend to. What it does is give a team a shared, memorable experience of speaking up safely, plus the language and habits to keep it going. It's a jolt and a common starting point. Leaders do the daily maintenance. There's more on the evidence behind all this on the science page.
A workshop that builds real psychological safety - and that people actually enjoy. Free 30-minute discovery call to talk through your team and your goals.
Book a discovery callThe shared sense that it's safe to take interpersonal risks - ask, admit, disagree, try - without being punished or shamed for it.
No. Nice-but-soft is a comfort zone. The high-performing version pairs safety with high standards, so people feel secure enough to do hard work and stay honest about it.
Repeated leader behaviours: own your mistakes, frame work as an experiment, ask real questions, and reward the person who speaks up. It builds slowly and breaks fast.
Yes, as a jolt and a shared reference point - a session where the team feels what safety is like and gains habits to sustain it. It won't fix a broken culture alone; that's ongoing leadership work.