Final answer:
Groupthink is the most significant threat to high-performing teams arising from collective illusions. It suppresses open communication, promotes false consensus, and hinders critical thinking.
Step-by-step explanation:
The most significant threat to high-performing teams arising from collective illusions is the phenomenon known as groupthink. Groupthink occurs when team members prioritize unanimity and conformity over critical thinking and open discussion of alternative viewpoints. This can lead to the suppression of dissenting opinions and the development of a false consensus within the team.
One symptom of groupthink is the illusion of invulnerability or the belief that the team is always right and cannot fail. This can prevent team members from objectively evaluating risks and potential problems, making them more susceptible to making flawed decisions.
Another symptom of groupthink is self-censorship, where team members withhold information or opinions that go against the perceived consensus. This stifles open communication and prevents the team from considering alternative perspectives or identifying potential threats.