cognitive biases

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• What Is Groupthink and Why Do Groups Make Bad Decisions?
  Groupthink is a pattern in which a close-knit group suppresses doubt to reach quick agreement, a process Irving Janis described in 1972 and linked to poor decisions.
• The Barnum Effect: Why Vague Personality Readings Feel True
  The Barnum effect is the tendency to rate vague personality descriptions as accurate for oneself, which helps explain why cold readings and horoscopes feel personal.
• The Hawthorne Effect: What It Is and Whether It Holds Up
  The Hawthorne effect is the tendency of people to change their behavior when they know they are being observed, a claim later reviews have made much less certain.
• Confirmation Bias
  The tendency to seek, interpret, and remember evidence in ways that favor existing beliefs, and how researchers test for it.