Psychological Safety at Work: Why It's the Foundation of High-Performing Teams

In 2012, Google launched one of the most ambitious studies of team performance ever conducted. Codenamed Project Aristotle, it analysed 180 teams across the organisation, examining hundreds of variables in search of what made some teams dramatically more effective than others. The researchers expected to find that the best teams were composed of the brightest individuals, or had the most experienced managers, or were structured in particular ways. What they found instead was simpler, more human, and more counterintuitive: the single most important factor in team effectiveness was psychological safety.

The term comes from Harvard Business School professor Amy Edmondson, who coined it in 1999 to describe a team climate in which people believe they will not be punished or humiliated for speaking up with ideas, questions, concerns, or mistakes. It sounds like a low bar — surely most workplaces offer this baseline? Research suggests otherwise. Studies consistently show that most employees censor themselves at work, holding back relevant information, concerns about poor decisions, or creative ideas because they fear the social consequences of speaking. The cost of this silence — in innovation foregone, mistakes uncorrected, and people ground down — is enormous.

Edmondson's Definition and the Google Project Aristotle Findings

Amy Edmondson's original research, conducted in hospital settings, found that teams with higher psychological safety actually reported more errors — not because they made more mistakes, but because they were willing to surface and discuss them. Teams with lower psychological safety had cultures of concealment that prevented learning and correction. This finding was initially counterintuitive to the hospital administrators who expected the highest-performing teams to report the fewest errors, but it encapsulates something essential about what psychological safety makes possible.

Edmondson defines psychological safety as «a belief that one will not be punished or humiliated for speaking up with ideas, questions, concerns, or mistakes.» It is important to note that this is a shared belief about a group environment — not an individual personality trait. It is not the same as comfort (psychologically safe teams often tackle uncomfortable subjects), trust between individuals, or team cohesion. It is specifically about the perceived safety of interpersonal risk-taking within the team.

Google's Project Aristotle confirmed and extended Edmondson's findings at massive scale. Of the five key dynamics they identified as characteristic of high-performing teams, psychological safety was by far the most important — foundational to all the others. Without it, the other four dynamics (dependability, structure and clarity, meaning, and impact) could not take root. The research was striking enough to shift Google's thinking about how teams should be built and led.

What Psychological Safety Looks Like in Practice

In a psychologically safe team, people feel able to ask a «stupid» question without being dismissed; to admit they do not know something without losing credibility; to raise a concern about a direction the team is taking without being seen as obstructive; to point out a potential problem with a plan without becoming the person who «doesn't get it»; and to propose an unconventional idea without it being ridiculed.

Critically, psychological safety is not the same as an absence of standards. High-performing psychologically safe teams are often also highly demanding. The difference is that in a psychologically safe environment, failure and uncertainty are treated as information to be learned from, not as evidence of individual inadequacy. Mistakes are debriefed, not prosecuted. Diverse viewpoints are actively sought, not tolerated.

Psychological safety also does not mean that everything anyone says is accepted or that difficult feedback is withheld. In fact, the opposite is true: when people feel safe, they can give and receive honest feedback more effectively, because the feedback is not experienced as an attack on their standing in the group. Candour becomes possible — and candour is one of the most important resources any team has.

Signs Your Team Lacks Psychological Safety

Many teams lack psychological safety without ever explicitly naming it as a problem. Instead, it manifests in subtler ways that are worth recognising. Self-censorship is one of the most reliable indicators: the meeting where everyone agrees, the discussions that happen in side-conversations and never in the room, the ideas that are never shared because they might seem naive or strange. When team meetings are largely performative — a venue for reporting and signalling rather than genuine thinking — psychological safety is typically absent.

Blame culture is another clear sign. When mistakes are met with finger-pointing rather than curiosity about what went wrong and how to prevent it, people rapidly learn that the safest course is to avoid any action that might go wrong, to minimise what they take responsibility for, and to look for someone else to attribute failure to. The result is risk aversion, innovation suppression, and an exhausting culture of self-protection.

Sycophancy — the tendency for team members to agree with whoever has the most power, regardless of the merits of their view — is perhaps the most destructive symptom of low psychological safety. When people are afraid to disagree with leaders, the organisation loses the diversity of perspective that allows it to navigate uncertainty and identify problems before they become crises. Leaders who surround themselves with people who always agree with them are not being well-served; they are being actively harmed.

Other signs include: people consistently avoiding the most senior person in a meeting; new team members taking a very long time to contribute; high-performing individuals becoming withdrawn or quiet over time; and a pronounced gap between what people say in formal meetings and what they say informally.

How Leaders Build Psychological Safety

The single most important thing a leader can do to build psychological safety is to model the vulnerability they want to see. This means openly acknowledging uncertainty («I'm not sure about this — what do others think?»), admitting mistakes («I got that wrong and here's what I learned»), and visibly welcoming challenge and disagreement («that's a really different perspective — tell me more»).

Edmondson identifies three specific leader behaviours that are most predictive of psychological safety: framing work as a learning problem rather than an execution problem, acknowledging one's own fallibility, and creating opportunities for others to speak up and demonstrate that their input is genuinely valued. The last of these is crucial — psychological safety is built not through announcements but through accumulated micro-interactions in which people test whether it is real.

Crucially, what happens when someone does speak up matters enormously. If a team member raises a concern and is immediately dismissed, contradicted, or met with visible irritation, every other person in the room receives a powerful signal about what speaking up costs. If the same concern is met with genuine engagement — even if the eventual decision goes a different way — the signal is equally powerful, and opposite. Leaders shape the environment through their responses, far more than through their declarations.

Responding productively to bad news is particularly important. Leaders who react to bad news with immediate blame or crisis set up a dynamic in which bad news is concealed until it is unavoidable, which is precisely when it is most costly to deal with. Leaders who respond to bad news as information — with curiosity, problem-solving orientation, and an explicit acknowledgment that it was right to raise it — build the culture that allows problems to be surfaced and addressed early.

Individual Strategies When Your Team Isn't Safe

What can you do when you are an individual member of a team with low psychological safety, without the positional authority to change the culture from above? This is a genuinely difficult situation, and it is important to be honest that the leverage available to individuals in these circumstances is real but limited.

One approach is to model the behaviours you want to see within your sphere of influence. Asking genuine questions, openly acknowledging uncertainty, and crediting others' ideas creates small pockets of safety even within an unsafe broader culture, and can sometimes be influential with peers who have similar values.

Another approach is to selectively and strategically raise issues in ways that reduce the perceived risk — framing concerns as questions rather than challenges, using curiosity rather than advocacy, and focusing on the work problem rather than interpersonal dynamics. None of this should require indefinite self-censorship, but it can be a pragmatic way to introduce perspectives that the team needs to hear.

If the broader culture is genuinely toxic — if speaking up reliably results in punishment or marginalisation — the honest answer is that individual strategies are unlikely to be sufficient. Documenting what happens, understanding your options, and prioritising your own mental health while you determine your longer-term course is often the most realistic path. A psychologically unsafe workplace is not something individuals should be expected to simply absorb indefinitely.

Psychological Safety vs Accountability — Not Opposites

A common misconception about psychological safety is that it conflicts with accountability — that a culture in which people feel safe is necessarily a culture in which poor performance is tolerated or standards are lowered. This misunderstands both concepts.

Edmondson explicitly addresses this in her work, distinguishing between a «comfort zone» (high safety, low accountability — where people are comfortable but complacent), an «anxiety zone» (high accountability, low safety — where fear drives performance but at the cost of honesty and innovation), and a «learning zone» (high safety, high accountability — where the combination of genuine care for the work and genuine safety to engage with it honestly produces the best outcomes).

High-performing teams hold themselves to high standards and create the conditions in which people can admit they are struggling, ask for help, acknowledge mistakes, and disagree with proposed approaches. These are not in tension — they are mutually reinforcing. Accountability without safety produces defensiveness and concealment. Safety without accountability produces complacency. The learning zone requires both.

Measuring Psychological Safety: Edmondson's 7-Item Scale

Edmondson developed a validated seven-item scale for measuring psychological safety within a team, which has been widely used in research and organisational practice. The seven items are:

• If you make a mistake on this team, it is often held against you. (reverse-scored)
• Members of this team are able to bring up problems and tough issues.
• People on this team sometimes reject others for being different. (reverse-scored)
• It is safe to take a risk on this team.
• It is difficult to ask other members of this team for help. (reverse-scored)
• No one on this team would deliberately act in a way that undermines my efforts.
• Working with members of this team, my unique skills and talents are valued and utilised.

Administering this scale — even informally — to a team can be a valuable starting point for conversation. The act of asking the questions itself signals that these dimensions matter and creates an opening for discussion that might otherwise never happen.

Psychological safety is not a luxury amenity for progressive organisations. It is the basic condition for good work to happen — for ideas to be refined rather than stifled, for problems to be surfaced rather than hidden, and for people to bring the full range of their capability rather than a carefully curated, risk-minimised fraction of it. Understanding and building it is one of the most valuable investments any team or organisation can make — and one of the most significant factors in determining whether work is a place where people can thrive, or merely survive.

If your work environment is affecting your mental health, explore our articles on stress at work and burnout. Building emotional intelligence can help you navigate these challenges, and tracking your mood is a useful way to monitor how your work environment affects your wellbeing over time.