Abstract
In this paper, we discuss, focusing on the human-oriented system based on the organizational structure and its values, the potential risks that are difficult to identify in the field of information system operation and maintenance. First, we present a risk management method that incorporates the fieldwork methodology. Next, we compare how human actions and risks are related in two projects, drawing on the case in which we applied the risk management method. Findings suggest that behaviors and values that are taken for granted by the project members lead to potential risks in invisible manner. Consequently, we found that a third party fieldworker could bring risks and underlying causes to the surface and engaging stakeholders in collaborative problem solving, and bridge often isolated operation and maintenance projects.