An emergency response systems (ERS) is usually responsible for delivering essential services to save lives and minimise environmental damage in case of small, frequent or large-scale emergencies. The ongoing global financial crisis, lack of professional resources, public sector cuts and rising public expectations are some of the challenges ERSs currently are facing. At the same time, societal trends in form of large-scale disasters such as tsunamis, storms, forest fires, terror attacks, and wars in the Middle East leading to mass migration have intensified recently and globally, increasing demand for these services in the public sector. As a result, emergency response actors are often under extreme pressure, and may need to seek assistance from and cooperate with other resources in society in order to become more effective. An emerging trend in ERSs in response to the challenges, in Sweden and internationally, is to create new forms of collaboration in emergency management (e.g., cross-sector collaboration, involving citizens in e-government, and involving volunteers). While research and practice have started to show the benefits of organising ERSs in new ways, the increasingly broad set of heterogeneous stakeholders involved in the collaborations introduce various challenges. Legal issues, unclear responsibilities of actors, difficulty in the categorisation of tasks, job insurance problems, diversity in education and background of actors, and difficulty determining actors' specific needs for IS support are some examples. Analysis of collaborations thus becomes increasingly complex, and must incorporate many aspects. Rudimentary analyses may result in failure of related projects and IS development, and ultimately in less effective collaborations. New forms of collaboration must therefore be analysed and understood rigorously, generally and in each specific context in order to develop them for ERSs and the public sector and to support actors with effective IS tools.This thesis develops and presents a framework for analysing new forms of collaboration in ERSs. It also provides an initial suggestion on how to apply the framework with a specific focus on IS development. The study was carried out as a qualitative case study based on three kinds of collaboration in the Swedish ERS: co-operative, cross-sector use of resources, involving civil volunteers in response operations and co-location of actors. The framework has fifteen dimensions. Sociotechnical systems theory and participatory design principles were applied to make the framework usable in the IS field. The framework can be used generally to analyse new forms of collaboration in ERSs in order to understand its different aspects and emergent challenges, such as actors' tasks, relevant laws, leadership and organisational factors, which may otherwise be overlooked, into the analysis process. As to IS development, the framework can contribute to organisational analysis and needs analysis in the participatory design of IS for ERSs, e.g. by helping to identi...