Research input constitutes a key component in the development of international environmental regime formation. Science-policy interaction is, however, complex and difficult, particularly because it is an encounter between two distinct systems of behaviour: the scientific ideal of impartiality and disinterestedness and the political reality of interest realisation and strategic behaviour. This study analyses the extent to which and how the institutional framework within which the science-policy dialogue takes place - through conscious design - can be utilised as an instrument to handle obstacles and barriers immanent of science-policy interaction and thereby serve as an instrument to enhance the effectiveness of the dialogue. Also, the impact of actor behaviour, particularly behaviour taking the form of leadership performance, is investigated. This book provides a detailed and in-depth empirical study of science-policy interaction in the Intergovernmental Panel on Climate Change (IPCC) from its establishment in 1988, to the provision of the Second IPCC Assessment Report in 1995. The main focus of the empirical investigation is on Working Group I of the IPCC.