Abstract: We describe a co-design method for emergency response scenario creation, to support the evaluation of new information technologies. The aim of our use of the method were to achieve scenarios that could be used in experiments or training sessions with professional emergency response personnel. We have analyzed how the method facilitated the design of scenarios (events, resource demands, communication between players), and the description of constraints in a resource management matrix. Our research indicates that the resource management matrix could be an important complement to function-centric analysis methods such as Functional Resonance Analysis Method (FRAM). We also illustrate how the interplay between play and situation description allowed us to simultaneously design and validate the scenarios with respect to playability versus resource demands. We discuss how the resource matrix can be used to adjust the validated scenarios after the design sessions. © 2012 ISCRAM.