Psychological safety is the shared belief within a team that it is safe to take interpersonal risks: to speak up, ask questions, admit mistakes and disagree without fear of embarrassment or punishment. The concept was defined by Harvard professor Amy Edmondson in 1999, and Google's Project Aristotle found it was the most important factor behind its effective teams. It is measured with a short team survey, best combined with observation of how teams handle mistakes and dissent.
What psychological safety is, and isn't
| It is | It isn't |
|---|---|
| Safe to raise problems and bad news | Being nice or avoiding conflict |
| Safe to admit mistakes and ask for help | Lowering performance standards |
| Safe to disagree with the leader | Everyone getting their way |
The highest-performing teams combine high psychological safety with high standards. Safety without accountability drifts toward comfort; accountability without safety produces anxiety and silence.
Why it matters
In Edmondson's original research with manufacturing teams, the better teams appeared to report more errors, not fewer. They weren't making more mistakes; they felt safe enough to talk about them, which let them learn. Google's Project Aristotle later studied hundreds of its teams and found psychological safety mattered more than who was on the team. When people don't feel safe, problems surface late, ideas stay unspoken and the same mistakes repeat.
How to measure psychological safety
1. Team survey
Edmondson's seven-item scale is the most widely used measure. Team members rate statements on whether mistakes are held against them, whether they can raise difficult issues, whether people are rejected for being different, whether it's safe to take a risk, whether it's hard to ask for help, whether anyone would undermine their efforts and whether their skills are valued. Scores are averaged at team level, never used to rank individuals.
2. Behavioral signals
- Who speaks in meetings, and who never does?
- How fast does bad news reach the leader?
- What happens right after someone admits a mistake?
- Do people disagree with the leader in public?
3. Team composition
Some teams have more people who tend to hold back under pressure or avoid conflict. Behavioral profiles at team level, like Cairo's team views, help leaders see where they need to work harder to draw voices out.
How leaders build psychological safety
- Frame the work as learning: say out loud that the problem is uncertain and you need everyone's input.
- Acknowledge your own fallibility: "I might be missing something."
- Ask real questions and wait for the answers.
- Respond productively to bad news: thank the messenger, then fix the problem.
- Draw out quiet voices in one-on-ones and by asking directly.
- Hold standards: safety and accountability go together.
These are skills, and skills improve with practice. Rehearsing how to respond to a mistake or a disagreement in a practice scenario makes it easier to do in the moment. For more, see leadership training for managers.
Frequently asked questions
What is psychological safety?
The shared belief within a team that it is safe to take interpersonal risks such as speaking up, asking questions, admitting mistakes and disagreeing.
Who created the concept of psychological safety?
Harvard Business School professor Amy Edmondson defined team psychological safety in a 1999 study.
How do you measure psychological safety?
Most organizations use Edmondson's seven-item team survey, averaged at team level, combined with observation of how teams handle mistakes and disagreement.
Does psychological safety mean no conflict?
No. Psychologically safe teams often have more open disagreement, because people feel safe to voice it.
Sources
- Edmondson, A., Psychological safety and learning behavior in work teams, Administrative Science Quarterly, 1999.
- Edmondson, A., The Fearless Organization, Wiley, 2018.
- Google re:Work, Guide: Understand team effectiveness (Project Aristotle).
