Consensus Isn’t Always a Sign of the Truth
When everyone agrees, a meeting feels like a success. But that feeling can be misleading.
In 1972, Irving Janis examined the Bay of Pigs invasion, decisions regarding the Vietnam War, and NASA meetings prior to the Challenger disaster. He found a common pattern in all of them: groups composed of talented, well-intentioned people suspend critical thinking under pressure to conform. He called this “groupthink” (Groupthink, 1982).
No matter how intelligent the group is, if the dynamics aren’t set up correctly, the quality of the decision can fall below that of an individual decision.
Why Aren’t We Speaking Up?
Someone thinks differently but remains silent. Why?
Because the social cost of “disagreeing with group consensus” often feels higher in the moment than the cost of “making a wrong decision.” The brain prioritizes short-term social risk over long-term organizational risk.
Chris Argyris described this dynamic as “defensive routines” (Overcoming Organizational Defenses, 1990). Over time, organizations learn which topics are off-limits, and this learning often becomes invisible. The question “What would happen if we said this?” goes unasked and unspoken.
This effect intensifies when a leader states their opinion at the beginning of a meeting. The room shifts from discussion to mere agreement.
Diversity Alone Is Not Enough
The claim that “diverse teams make better decisions” is true but incomplete. Katherine Phillips’s research (2014) shows that diversity improves decision quality only in environments where different perspectives can truly be expressed. If different people are subject to the same pressure to conform, diversity remains merely superficial.
Daniel Kahneman, Olivier Sibony, and Cass Sunstein present a similar finding in their book Noise (2021): groups can reach very different conclusions while looking at the same data because context, order, and social cues shape judgment.
What’s the Point?
Janis’s own recommendations are supported by research:
Leaders should not share their views at the beginning of a meeting. The first opinion expressed sets the tone for the rest.
The role of “devil’s advocate” should be assigned. The person tasked with generating counterarguments faces an expectation—not pressure to conform.
Independent evaluation in subgroups. When everyone processes the same information at the same time, it accelerates the convergence of opinions.
Collect input anonymously. Especially in hierarchical structures, separating opinions from names improves the quality of the content.
These are process design issues. Team coaching can be used at this point to restructure decision-making processes.
“Groups do not have to be smarter than the sum of their individual members. But they can be—if the dynamics allow it.” > Irving Janis, Groupthink, 1982
Cevvela’s Perspective
- Groupthink occurs even in teams composed of intelligent people; the problem is not ability, but process design (Janis, 1982).
- Consensus may be a sign of conformity rather than correctness; confusing the two lowers decision quality.
- A leader sharing their opinion too early hinders independent evaluation.
- Diversity is effective only when different voices are truly heard (Phillips, 2014).
- Team coaching can be used in this process to redesign decision-making structures and bring “the unspoken” to light.
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