What does it mean that team cognitive biases?

Groups have their own biases above and beyond individual ones — groupthink, anchoring, shared information bias, and polarization.

Example: A product team at a growth-stage startup was evaluating three approaches for a major platform redesign. The VP of Engineering spoke first in the decision meeting: 'I think Option B gives us the best balance of speed and flexibility.' Over the next forty-five minutes, every other team member endorsed Option B. The discussion was polite, thorough-sounding, and unanimous. After the meeting, the senior backend engineer told a friend over coffee: 'I actually thought Option A was significantly better for our data model, but everyone seemed so aligned on B that I figured I was missing something.' A junior frontend engineer said the same thing independently: 'I had serious concerns about B's client-side performance, but the VP seemed confident and nobody else raised issues, so I stayed quiet.' A post-launch analysis six months later confirmed: Option A would have been objectively superior by the team's own stated criteria. Option B was chosen not because the team evaluated and preferred it but because the VP's early statement anchored the discussion, and the social dynamics of the group suppressed the dissenting information that would have produced a better decision. The team did not fail individually. Each member had relevant knowledge and sound judgment. The team failed collectively — its cognitive architecture amplified one person's initial frame and systematically filtered out information that contradicted it.

Try this: Conduct a bias audit of your team's last three major decisions. For each decision, answer four questions: (1) Who spoke first, and did the final decision align with their position? (Anchoring test.) (2) Was any significant piece of information held by only one or two members? Did it surface during the discussion? (Shared information bias test.) (3) Was the final position more extreme than the average individual position before the discussion began? (Polarization test.) (4) Did anyone voice a concern that was then not addressed or incorporated? (Groupthink suppression test.) If any decision shows positive results on two or more tests, the team has a collective bias pattern that should be addressed through structural interventions — not through exhortations to 'speak up more.'