Abstract: The need for information systems (ISs) to aid emergency management (EM) has been well established. Yet, despite the acknowledged benefits of ISs for EM, the support of ISs in the preparedness phase is weak. Complex EM operations require coordinated efforts across emergency organizations, which are facing enormous challenges related to the method of collaboration to cope with the impact. This paper presents an ongoing project initiated to develop an emergency management collaboration repository for a range of emergency responders, focusing on emergency cross-organizational collaboration, information sharing, exercises, and evaluations. A participatory design approach was applied for the system requirements elicitation and was carried out in two workshops with several EM stakeholders.