Abstract
The core-task analysis, proposed by Leena Norros (2004), was introduced along with its academic background, major concepts and theoretical framework, and examples of specific case studies. First of all, traditional psychological models are not adequate to analyze recent organizations and workplaces that are characterized by possibilities of huge risk and complication of technology. Instead, it is required to illuminate core-task, i.e. integral tasks to secure process control, by observing the entire picture of complicated processes and to clarify appropriate actions that should be taken by organizational members. For this purpose, structural background that determines member's action and produces possible risks is focused on by depending on the activity theory proposed by Y. Engeström. At the same time, the semiotics is harnessed to analyze ‘habits' of individuals that determine what specific action is chosen. Case studies on the training of anesthetist and the operating process of large vessels are described to show possibilities of the core-task analysis for both practice and research.