This focuses on decision-making processes, particularly within the context of aviation. It categorizes decisions along a continuum, ranging from effortful analytical decisions to quick, intuitive ones and those using unconscious shortcuts. The document elaborates on the characteristics, applications, and challenges of analytical decision-making, including the use and limitations of decision aids and the importance of reviewing decisions. It then explores quicker decision mechanisms like biases and heuristics, acknowledging their efficiency but also their potential for error, before discussing very fast, recognition-primed intuitive decisions and their basis in expertise. Throughout, the text emphasizes the practical application of these theories for training and assessment, encouraging a nuanced understanding of real-world decision-making beyond idealized models.