"This book describes the emergence of a new method, the Core-Task Analysis (CTA), to analyse complex work in risky environments. The notion "core-task" denotes the objectives and the outcome-critical content of work, which should be taken into account by the actors in everyday task performance. The orientation to the core task characterises work practices and culture. CTA adopts a systemic notion of human activity. Situated actions are conceived from an ecological, human-environment interaction perspective. The CTA methodology integrates several theoretical approaches. It exploits ideas of the cultural-historical theory of activity and the functionally oriented cognitive task analysis tradition, and it also borrows the pragmatist concept of habit for the analysis of practice. These approaches share a systemic notion of human activity and conceive action from an ecological, human-environment interaction perspective. Explaining actions from the point of view of their meanings characterises these approaches and the CTA-methodology. The CTA can be used in analysis, evaluation and development of work practices and culture, and it provides a framework for interdisciplinary studies of high-technology work. The method was developed in studies of work in four technologically highly mediated work domains. These are flexible manufacturing, nuclear power plant operations, anaesthesia and navigation of large ships. Furthermore, the book reports empirical results concerning the nature of decision making and action under dynamic, complex and uncertain environments, and comprehends habits that might explain the observed differences in actual situational courses of action. ..."

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