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What Is Groupthink And How Does It Affect Good Judgement?

The Psychology of Groupthink: Why Good Judgement Gets Lost in Groups & How to Protect It

/ Thoughts, Connection, Identity, Social / By

A group does not need to silence anyone out loud for people to start editing themselves.

It can happen in a meeting that looks perfectly healthy from the outside. Someone offers a plan. A senior person nods. A few people add support. The room begins to settle. And somewhere in that settling, one or two people quietly decide not to say the thing they were thinking.

This phenomenon is an example of Groupthink.

Groupthink is a term used to describe what can happen when the desire for agreement inside a group becomes stronger than the willingness to question, test, or reconsider the group’s direction. Irving Janis, an influential research psychologist, described it as a way of thinking that can occur when concurrence-seeking becomes so dominant that it overrides a realistic appraisal of other options (Janis, 1971).

Groupthink is what happens when a group slowly loses access to the intelligence of its own members.

So let’s look at how groupthink forms, why disagreement can become difficult even for thoughtful people, how consensus can narrow rather than sharpen judgement, and what groups can do to protect clearer thinking.

Groups Are Not The Problem

Groups can help people think better.

A good group brings different memories, skills, experiences, and interpretations into the same space. One person may notice a practical risk. Another may understand the emotional impact. Someone else may see the financial, ethical, or strategic angle. At their best, groups solve for blind spots that an individual might not catch alone.

The challenge is that these benefits are not automatic. A group improves thinking only when difference can survive inside it. If cohesion becomes more important than examination, the same group that could have balanced judgement may begin to narrow it.

This is an important distinction. Janis was not arguing that closeness itself is the problem, or that all cohesive groups are doomed to poor decisions. In fact, he noted that groups with properly defined roles and traditions of critical inquiry may make better decisions than individuals working alone. His concern was closeness under pressure: groups whose members work closely together, share values, face intense stress, and begin to treat loyalty as a reason to avoid difficult questions (Janis, 1971).

Most of us have been on both sides of this. We have been the person with the unspoken concern, and we have also been the person relieved when no one complicates a decision. That is why groupthink is worth consideration. It is not a flaw that belongs to other people. It is a risk built into ordinary human cooperation.

Agreement Has A Pull

Agreement has an attractive social reward.

It keeps the room moving. It makes someone seem cooperative, aligned, and easy to work with. Disagreement, even when useful, asks more of the group. It interrupts the rhythm. It introduces friction. It may make the person speaking feel exposed.

We know this from experience. Before speaking up, people often make a quick calculation: Is this worth saying? Will it sound difficult? Has everyone else already moved on? Am I missing something obvious?

Solomon Asch’s conformity experiments help explain why that moment can be so powerful. In his study, a participant was placed as a “minority of one” against a unanimous majority. The task was almost embarrassingly simple: look at different lines and choose the ones with the same length . The pressure came from being the only person in the room seeing them differently.

In the control condition, where people judged without group pressure, errors were very low. But when participants had to respond publicly after hearing a unanimous majority give the wrong answer, the majority distorted about one-third of reported estimates (Asch, 1956).

The point is not that people cannot see what is in front of them. Asch’s results were not a story of total submission. Many people remained independent in many of their answers. The insight is that public disagreement (or agreement) has a massive impact. The person is no longer only answering, “What do I think?” They are also answering, “What will it mean if I am the only one saying something different?”

This is often where groupthink begins. Not with blind agreement, but with the first small calculation about whether disagreement is worth the cost.

When Doubt Stays Private

In many groups, doubt does not disappear. It is simply brushed under the rug.

Someone may still notice the weak point in an argument. They may still feel that the decision is moving too quickly. They may still wonder whether an alternative has been dismissed too easily. But instead of entering the shared conversation, that doubt remains private.

That is a subtle but serious shift. A group cannot consider concerns that aren’t shared and discussed.

Asch’s research is helpful here because it shows how much the public nature of disagreement can matter. In one variation of his study, the majority still gave its answers aloud, but the participant wrote down his own answer instead of announcing it publicly. Under this condition, errors fell to 12.5% of critical estimates, about one-third of the level found in the original public-response condition (Asch, 1956).

In plain language: when people did not have to expose their disagreement in the same public way, they were better able to stay with what they saw. The format of the group affects what people are willing to express.

This is why groupthink is not always the absence of doubt. It is often the loss of access to doubt. The group may still contain good judgement, but that judgement is no longer entering the conversation.

Silence Can Sound Like Consensus

Once doubts stay private, the group begins to misread itself.

No one objects, so the room assumes there are no objections. No one raises a concern, so the decision starts to gain confidence. A lack of visible disagreement becomes evidence of alignment.

But silence can mean many things. It can mean uncertainty. It can mean fatigue. It can mean respect for hierarchy. It can mean fear of conflict. It can mean someone has a concern but has decided the room is not ready to hear it.

Janis describes this kind of pressure as especially powerful in cohesive groups. He argued that groupthink can involve the non-deliberate suppression of critical thought. In other words, people may not be deliberately hiding information or consciously choosing poor judgement. Instead, they internalise the group’s norms. They begin to believe the group’s preferred option is probably sound, and their own misgivings are treated as less relevant than the need to maintain consensus (Janis, 1971).

This is one reason groupthink can feel so normal from the inside. It does not always sound like, “You are not allowed to disagree.” It may sound commonplace.

“Let’s not overcomplicate this.”

“I think we’re all aligned.”

“We already discussed that.”

“We need to move forward.”

Sometimes a group really does need to decide. Sometimes more debate would only repeat what has already been said. But sometimes, these phrases can close the door before the crucial thinking is finished.

Janis gave names to several patterns that can appear in this kind of group: self-censorship, pressure on dissenters, rationalising away warnings, and mistaking silence for unanimity (Janis, 1971). 

In everyday life, these patterns may look ordinary. Self-censorship may sound like, “It’s probably not worth bringing up.” Pressure on dissent may sound like, “Why are you still pushing this?” The illusion of unanimity may sound like, “No one objected, so everyone must agree.”

Groupthink often works because it feels like efficiency.

The Group Leans Harder

Once a group has mistaken silence for agreement, another problem can appear: the group does not simply hold its position. It can begin to strengthen around it.

A decision slowly becomes “our decision”. A view becomes “our view”. Revisiting it can feel less like careful thinking and more like reopening something the group has already settled.

Moscovici and Zavalloni’s research helps explain this movement. Their study examined whether group discussion would simply average out individual views or shift them in another direction. The sample was limited: 140 male secondary school students, aged 18 to 19, in Paris. Although not experimentally confirmed for other groups and other settings (subsequent research has bridged this gap), its findings are still useful for understanding how discussion can shape judgement (Moscovici & Zavalloni, 1969).

The researchers found that group discussion to consensus produced shifts towards more extreme positions. Put simply, the group did not just agree. It leaned harder. The final group position often moved further in the same direction that was already present before discussion. Those shifts also appeared in later individual ratings, suggesting that people could come to personally adopt the position reached through group discussion (Moscovici & Zavalloni, 1969).

This is what “polarisation” means in this context. It does not only mean hostility or political extremism. It means that after group discussion, a view may become more strongly held, more sharply defined, or further from the middle than it was before.

The research is relevant to groupthink because it challenges a comforting assumption: that groups naturally balance people out. Sometimes they do. But under certain conditions, discussion can sharpen the group’s dominant direction instead of softening it.

Analytical thinking depends on keeping more than one possibility alive long enough to examine it. Rushing to consensus can close that space prematurely.

Certainty Is Not Thinking

A group can become more certain without becoming more competently analytical.

That is one of the quiet dangers of groupthink. The group may still have meetings, slides, questions, and discussion. From the outside, it may look thoughtful. But the questions get narrower. The risks become familiar. The alternatives receive less oxygen. People learn which concerns slow the room down, and which ones help the room feel decisive.

Agreement reduces friction. Silence reduces visible doubt. Repetition makes the group’s position feel familiar. Commitment makes reversal feel costly. Over time, confidence may grow not because the idea has been tested, but because the group has become socially organised around it.

Moscovici and Zavalloni suggest that group interaction can increase involvement and commitment. When people become invested in a position, parts of the issue become more meaningful, sharper, or more “salient”. Salient means that something stands out more strongly in the mind. In a group, the parts of an issue that fit the group’s direction may become louder, while other parts become easier to overlook (Moscovici & Zavalloni, 1969).

They also found that group interaction tended to reduce the number of categories or scale positions used. In simpler terms, after discussion, the group expressed attitudes in a more clear-cut or black-white way than individuals had beforehand (Moscovici & Zavalloni, 1969).

That matters because analytical thinking often needs room for softer categories: “maybe”, “not yet”, “partly”, “under these conditions”, “we need more information”. A group under pressure may prefer cleaner categories: yes or no, aligned or difficult, confident or hesitant.

This is where groupthink can narrow thinking without anyone intending harm. A leadership team may agree to an unrealistic launch timeline because everyone wants to appear confident. A clinical team may understate uncertainty because the room is tired and overstretched. A family may avoid questioning a plan because one person has already invested emotionally in it.

The danger is not that people stop caring. It is that the group starts rewarding momentum more than examination.

Before long, the room may stop asking the questions that would have protected it:

What are we missing?

What would make this decision wrong?

Who sees it differently?

What alternative have we dismissed too quickly?

Are we agreeing because the evidence is strong, or because the room has already moved?

Groupthink can make us feel responsible. It may feel like unity, loyalty, decisiveness, or maturity. But if the group has made doubt hard to express, that unity may not be as strong as it appears.

Make Disagreement Easier

If groupthink develops when doubt becomes hard to express, better group thinking begins by making useful disagreement easier to surface.

That does not mean every meeting needs to become a debate. It does not mean disagreement should be constant, performative, or careless. It means groups need structures that allow concerns to appear before the group becomes too committed to ignore them.

Because people edit themselves in public, it helps to capture private judgement first. Before a discussion begins, ask people to write down their initial view, concern, or recommendation. This protects early thinking from being immediately shaped by the loudest, most senior, or most confident person in the room.

Because silence is often misread, it helps to ask directly for concerns. Not “Does everyone agree?” but “What would worry us about this plan?” or “What might we be underestimating?”

Because consensus can easily harden, it helps to create a second-chance moment. Before finalising a decision, give people another opportunity to raise what has not yet been said. Doubt sometimes arrives late. People may need time, distance, or a quieter setting to realise what is bothering them.

Because groups can protect their own direction, it helps to invite outside perspectives. Someone outside the group’s shared assumptions may notice what insiders have stopped seeing.

Janis’s own recommendations about groupthink point in this direction. He suggested safeguards such as assigning a critical evaluator role, encouraging objections, consulting outside experts, dividing into subgroups, and holding a “second-chance” meeting before a final decision so members can express remaining doubts (Janis, 1971).

Asch’s work also supports the importance of reducing the public cost of dissent. When participants no longer had to announce disagreement aloud in the same way, conformity dropped (Asch, 1956).

For real groups, the lesson around groupthink is not that every decision should be private. It is that the design of the conversation matters. If the only way to disagree is to challenge the room after momentum has already formed, many people will stay quiet. If the group creates calmer, earlier, more structured ways to raise concerns, better information can enter the decision.

The goal is not to make groups less unified. It is to make their unity more organic.

Groupthink is not proof that people cannot think well together. It is a reminder that thinking together requires the right conditions.

People want to belong. They want to cooperate. They want to avoid unnecessary conflict. Those motives are human, and often helpful. But when harmony becomes more important than examination, groups can mistake quietness for agreement and confidence for clarity.

The aim is not to make every group slower, colder, or more suspicious of itself. It is to keep the room open long enough for people to say what they can see.

The healthiest groups are not the ones where everyone agrees quickly. They are the ones strong enough to hear doubt before certainty hardens.

To think well together, groups do not need to eliminate tension. They need to make room for the right kind of tension — the kind that helps people bring their private judgement back into the room.

And if you need help being authentic within groups we’re always just a call away!

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