Thomas Ludwig reveals design characteristics while researching information infrastructures and their diverse information resources, types of users, systems, and divergent practices. By conducting empirically based design case studies in the domain of crisis management, the author uncovers methodological and design challenges in understanding new kinds of interconnected information infrastructures from a praxeological perspective. Based on implemented novel ICT tools, he derives design characteristics that focus on integrating objective and subjective queried insights into the situated activities of people, as well as emphasizing the subjective nature of information quality.