Abstract: In the new millennium new technologies (should) play an ever more prominent role in the management of mass casualty incidents (MCI). Drawing on empirical data from a four-year research project (SOGRO), the article reflects on the impact of information technologies (IT) on the organisation of emergency response and on rescue services against the backdrop of broader organisational shifts and contemporary demands. Because IT strengthens a particular way of MCI management, it is firstly described as expressing and reifying specific considerations of emergency response experts. Secondly, the benefits of an IT-based emergency response are critically reviewed. IT collects and makes available data about the rescue operation. Thus, it makes a formerly blurred rescue operation transparent. Although its operational benefit remains vague for on-scene executives, the visualisation reduces uncertainties among them. Thirdly, the article points out the inherent logics of IT. Its implementation not only satisfies newly evolved information needs, but also increases the control density.