The study of reproducible errors of human reasoning, and what these errors reveal about underlying mental processes, is known as the heuristics and biases program in cognitive psychology. This program has made discoveries highly relevant to assessors of global catastrophic risks. Eliezer Yudkowsky, who writes on the subject of cognitive biases at Overcoming Bias, presented at the Global Catastrophic Risks conference in Mountain View was on the subject of cognitive biases in the assessment of risk.