The aim of the research presented in this book was to investigate the application of Neisser’s (1976) perceptual cycle model (PCM) to study the process of aeronautical decision-making (ADM) both in individuals and teams. This aim encompassed validating and advancing the explanatory power of the PCM. The main findings are summarised later, including a discussion of the contributions and associated implications of the research. The work presented in the book was structured around three key objectives, and the findings are summarised in relation to these objectives.