Airline pilots often have to face sudden, unexpected situations that can become potentially dangerous. This book identifies common denominators in pilots reactions to dangerous, unexpected events and highlights behavior common to all in complex, stressful situations. It applies an original cognitive analysis method to highlight actual operational behavior within a quick succession of short mental segments lasting less than one minute. This rational method of assessing human potential should contribute to a more effective distribution of roles and help to optimize the pilotaircraft interface.