The concept of wicked problems has served as an inspiration for research in a variety of research fields but has also contributed to conceptual confusion through the various ways in which it has been defined and used. In this special issue, a number of ontological, theoretical and methodological issues are discussed. First, while its use as a buzzword has undermined precise conceptual definition, recent work goes beyond the wicked versus tame dichotomy and conceptualizes wickedness as a matter of degree, differentiates between dimensions of wickedness and emphasizes the relational character of problem definitions. Second, new and existing governance approaches have often been unproblematically proposed as ways to solve wicked problems, whil...