The integration of Software Engineering (SE) and Human-Computer Interaction (HCI) methods and models is an interesting means for modelling an organization's activities, with software applications being part of these activities. It is particularly relevant for organizations concerned by current or future Computerized Physician Order Entry systems for medications. Integrating these SE and HCI methods and models allows case studies to be seen from the technical, organizational and ergonomic perspectives, and may also make it easier to compare current and future work situations. These techniques can be exploited to translate the data provided by Human Factors specialists by creating efficient communication supports that can be easily understood by all project partners, particularly computer scientists, which will facilitate software re-engineering or design. In this paper, the basic principles behind such communication supports are described and illustrated by a real case study. Keyw...