The report presents the results of the requirements analysis for the IMPACT argumentation toolbox. The IMPACT requirements are based on the state-of-the-art of re- search in participatory policy making and policy consultation, on interviews with and observations of potential future users of the system such as facilitators of eParticipa- tion initiatives as well as policy makers and on interactive scenario workshops helping to identify the needs of users. 

IMPACT argumentation tools are designed to make it easier to collect policy proposals and arguments about the pros and cons of policy proposals, identify stakeholder interests and values, reconstruct arguments from natural language texts collected from weblogs and discussion forums distributed throughout the Internet, visualize networks of arguments, evaluate arguments, reveal implicit premises, and ask relevant critical questions. 

Policy making is modelled as an abstract process to identify common practices across national contexts and governmental levels. Interactions between policy makers and stakeholders are found especially in the phases of agenda setting and policy formulation, with the policy formulation phase as the main context of use for IMPACT tools. 

Just how IMPACT argumentation tools would support consultation processes is illustrated in a hypothetical scenario. The EU's consultation on the Green Paper on Copy- right in the Knowledge Economy was chosen to analyse the state-of-the-art and the potential impact of argumentation tools in the consultation process. With the help of tpyical users – so-called „personas“ –, the most important use cases for each of the Impact argumentation tools are presented. The report lists the corresponding requirements from these use cases together with the non-functional requirements to guide the design of the individual tools as well as the IMPACT argumentation toolbox as a whole.