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The main purpose of this paper is to provide a biographical sketch of the late Hans L. Zetterberg and a historical background to a translation of an essay based on a lecture given by Zetterberg in Stockholm in 1995. In it, he recounts his time at the Department of Sociology at Columbia University in the years 1953–1964. This essay is full of insights into an inspiring and formative period for Zetterberg in the United States, particularly in the stimulating milieu that was Columbia, at this time the center of American sociology led by Robert K. Merton and Paul Lazarsfeld. In the introduction to this translated essay, I give a brief overview of the establishment of sociology as a discipline in Sweden, and the transfer of knowledge between the United States and Sweden (and Europe, more broadly), embodied in Hans Zetterberg. In the post-WWII years, American sociology, which had a strong positivistic imprint, played an important role in shaping the beginnings of Swedish sociology. However, the transfer of knowledge went both ways, with Zetterberg, a semi-central and often neglected figure, being both a significant contributor to sociology at Columbia in its period of greatest prominence, and in his native Sweden. [ABSTRACT FROM AUTHOR]

Adaptive co-management (ACM) is a key concept in science and an increasingly adopted policy response in conservation, associated with a number of positive outcomes. However, the effects and mechanisms of co-management arrangements, including the conditions under which ACM gives rise to higher levels of internal and external legitimacy, are yet to be explored. This endeavor, in turn, requires theoretically driven models providing assumptions and outlining testable hypotheses. Considering the social challenges of ACM and using an institutional change within the Swedish carnivore management system aimed at achieving legitimacy through co-management as an illustrative example, this article develops a conceptual model that encompasses conditions and possible explanations to ACM outcomes. More specifically, drawing on lessons from social theory, we model the impact of three key factors-social networks, deliberation and learning-on the external and internal legitimacy resulting from ACM arrangements. Based on the model proposed, the popular assumptions of ACM outcomes can thus be empirically scrutinized and the conditions for increased legitimacy through ACM arrangements better comprehended. [ABSTRACT FROM AUTHOR]