This document discusses various biases and errors that can negatively impact decision making, such as heuristics, overconfidence bias, immediate gratification bias, anchoring effect, selective perception bias, framing bias, and availability bias. It also outlines guidelines for effective decision making, such as understanding cultural differences, knowing when to quit, and using an effective process. An effective process focuses on importance, is logical and consistent, acknowledges both subjective and objective thinking, and requires only necessary information. Group decision making can provide benefits like more complete information but also disadvantages like time consumption and pressure to conform. Culture also impacts decision making approaches.