There is a specific, reliable pattern on r/PMP: "I scored 80%+ in PMI Study Hall. I felt ready. I failed the real exam." The knee-jerk explanations are usually wrong. It isn't that Study Hall is "easier than the real exam" (it's generally considered harder). It isn't that candidates "got nervous." It isn't that the exam was sadistically curved. The real explanation, in almost every case, is one of three decision biases, patterns of thinking PMI explicitly engineers against, but which generic Study Hall rationales don't name, don't diagnose, and don't correct. Here are the three, in order of how frequently they show up in failure post-mortems. Bias 1: Escalation bias What it looks like When a situation gets complex, uncomfortable, or political, you pick the option that brings in a higher authority. "Escalate to the sponsor." "Involve the PMO." "Talk to the functional manager." "Consult the steering committee." Why you have it Escalation feels safe. It distributes the risk of being wrong.…