In this paper, we present a model that describes the stages of the implementation of an information system in a health care organization. The model offers no explanation of the implementation process but rather describes in a cyclic order the domains that are relevant when implementing a system. The model offers thus an opportunity to identify gaps in our knowledge and understanding of implementation processes and provides also the conceptual basis for a higher education course of health informatics that is focusing on organizational change and the pivotal role of information and communication technology.