The objective of the article is to analyse the use of Humanities and Social Sciences (HSS) in public risk assessment and risk management organisations in France, Germany, the UK, the Netherlands, Canada and the United States based on more than a hundred interviews conducted with social sciences experts employed by or working for these organisations. If the added value brought by the integration of social scientists is recognised, the use of social sciences differs from one organisation to another. The article compares the different positions given to social scientists inside and outside the organisation, the various methods used and the different contents produced. The survey highlights a set of initiatives that are scattered, differentiated and ultimately have little in common – except that they often play a marginal role in the main activities of the agencies concerned