Non-defense related industry and public organizations are becoming more and more interested to utilize the power of information fusion applications. The journey from “we have a lot of data from different sources and we would like it to be fused” to well-defined requirements for information fusion applications may however be long and the steps to be taken far from clear. This research in progress paper reflects on the initial steps of a systems requirements analysis in a case study at a maintenance service organization. What questions need to be answered according to existing requirements analysis methods? Where and how can answers be obtained? What problems can arise and how can one handle these? The experiences gathered and discussed can be a basis of the improvement of requirements analysis methods and give a richer understanding of the application of such methods.