This paper argues that it is time for public understanding of science to develop a critical inventory of the forms, formats and methods of public participation and their respective implications and ambiguities. It highlights the need for analysing not only the limitations and deficiencies of participatory arrangements but also their constructive dimension, in particular the construction of the subject of participation. Looking into participatory governance arrangements in the issue area of genetic testing in Germany and the UK the paper presents a typology of formats according to the way the respective public is constructed and identifies four major constructions of publics: the general public, the pure public, the affected public and the partisan public. Each of these enables certain speaking positions while foreclosing others. The study shows that the main purposes of participatory arrangements in this issue area are knowledge production and education rather than political deliberation and decision-making.

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The term "externalization" is used by a range of migration scholars, policy makers and the media to describe the extension of border and migration controls beyond the so-called 'migrant receiving nations' in the Global North and into neighboring countries or sending states in the Global South. It refers to a wide range of practices from controls of borders, rescue operations, to measures addressing the drivers of migration. The ambition of this Special Issue is to contribute to the mapping of the responses to externalization dynamics. The different articles in this volume are chosen to exemplify some of these processes at different levels of analysis. Through diverse disciplinary perspectives, the authors show how practices of externalization are being confronted, succumbed, modified and contested by individual (would-be) migrants, civil society actors and the host states' institutions in different parts of the globe. In an effort to move away from a sole focus on border zones in the Global North, the Special Issue contributes to emerging literature shifting the locus of analysis to places in the Global South, which are conventionally understood as "transit" or "sending" countries in Africa, America as well as within Europe itself.