The document discusses groupthink, a psychological phenomenon in which group cohesion leads to faulty decision-making due to pressure to conform and lack of critical evaluation. It outlines its symptoms, such as the illusion of invulnerability and direct pressure on dissenters, as well as remedies like encouraging critical evaluation and involving external experts. The text also highlights the importance of diverse perspectives and effective leadership in mitigating groupthink and fostering better decision-making in collaborative settings.