Information systems (IS) seem prevalent in modern societies and this has resulted in the rapid digitalisation of different societal sectors. One application domain of IS is emergency response systems (ERSs), which are responsible for delivering essential services to save lives and minimise environmental damage in both small, frequent and large-scale emergencies. Specific IS applications are in turn used in ERSs to support such aspects as decision-making, communication, information sharing and the dispatching of resources. Public sector cutbacks and a lack of professional resources have negatively affected emergency response at the same time as natural and man-made disasters (e.g. forest fires, storms, terror attacks) have intensified in recent decades. At the same time, frequent, small-scale accidents continue to occur, both in urban and sparsely populated areas. As a result, emergency response actors, first responders, are often placed under severe pressure. An emerging trend in response to these challenges, both in Sweden and internationally, is to create cross-sector forms of collaboration, by combining alternative resources from various sectors. Since these collaborations are relatively new and involve heterogeneous stakeholders, it is essential to understand the context, as well as actors' tasks and needs in related IS development processes. When the work on this thesis started, there was a perceived lack of knowledge relating to ERS cross-sector collaboration and the associated needs for digitalisation/IS support; for example, in which situations actors should be involved, what they should do, what challenges they may face and how these may affect IS.Organisational and needs analyses are deemed essential first steps that can be used to understand the nature of these collaborations, their heterogeneous users and stakeholders, potential needs, and related opportunities and challenges. One way to do this is to enable user participation, gaining help from stakeholders who may know the context. However, despite the many perceived benefits, user participation is also associated with several challenges; for example, how to identify and involve relevant stakeholders, especially when they are numerous and heterogeneous. These challenges have been discussed in relation to the new public sector but not specifically in the development of cross-sector collaborations in ERSs. Furthermore, using different frameworks for performing organisational/stakeholder/needs analysis in new domains can help to structure them. At the beginning of the work on this thesis, there was a perceived lack of broad frameworks for ERS cross-sector collaborations that could be used as tools in the related analysis and user participation activities. Finally, at a theoretical level, it was deemed interesting to use network governance as an analytical lens to enable a further understanding of the ERS cross-sector collaboration phenomenon.The thesis objective is thus to explore IS-related opportunities, challenges and needs aimed at supporting heter...