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This Element explores the uncertain future of public policy practice and scholarship in an age of radical disruption. Building on foundational ideas in policy sciences, we argue that an anachronistic instrumental rationalism underlies contemporary policy logic and limits efforts to understand new policy challenges. We consider whether the policy sciences framework can be reframed to facilitate deeper understandings of this anachronistic epistemic, in anticipation of a research agenda about epistemic destabilization and contestation. The Element applies this theoretical provocation to environmental policy and sustainability, issues about which policymaking proceeds amid unpredictable contexts and rising sociopolitical turbulence that portend a liminal state in the transition from one way of thinking to another. The Element concludes by contemplating the fate of policy's epistemic instability, anticipating what policy understandings will emerge in a new system, and questioning the degree to which either presages a seismic shift in the relationship between policy and society.

Abstract
What is the relationship between political stability, trust, and source effects on support for public policies? In this article, we examine how source type (and the trust respondents have in different sources) impacts support for new policies and the degree to which this impact is moderated by political stability. This article reports the results of a survey experiment administered simultaneously in Australia and Hong Kong in late 2020 examining source effects on public attitudes toward COVID-19 vaccination and testing policies. For each case, the analyses compare source effects between a lesser trusted source (government) and a more trusted source (medical scientists). The study also compares these effects between cases, contrasting an environment of continuing political stability (Australia) with one of decreasing political stability (Hong Kong). Australian respondents tended to have similar attitudes toward policies regardless of the source, while Hong Kong respondents looked significantly more favorably on policies put forward by medical scientists than those put forward by the government. The results show that source effects can be moderated by political context—a finding that holds implications for the design of comparative studies about public trust and political legitimacy in settings where policy development relies on scientific input.

Evolutionary governance theory (EGT) provides a basis for holistically analyzing the shifting contexts and dynamics of policymaking in settings with functional differentiation and complex subsystems. Policy assemblages, as mixes of policy tools and goals, are an appropriate unit of analysis for EGT because they embody the theory's emphasis on co-evolving elements within policy systems. In rational practice, policymakers design policies within assemblages by establishing objectives, collecting information, comparing options, strategizing implementation, and selecting instruments. However, as EGT implies, this logical progression does not always materialize so tidily—some policies emerge from carefully considered blueprints while others evolve from muddled processes, laissez faire happenstance, or happy accident. Products of the latter often include loosely steered, unmoored, and 'non-designed' path dependencies that confound linear logic and are understudied in the policy literature. There exists the need for a more intricate analytical vocabulary to describe this underexplored 'chaotic' end of the policy design spectrum, as conjuring images of 'muddles' or 'messes' has exhausted its usefulness. This article introduces a novel metaphor for non-design—the bird nest—to bring studies of policy design and non-design into lexical harmony.

Evolutionary governance theory (EGT) provides a basis for holistically analyzing the shifting contexts and dynamics of policymaking in settings with functional differentiation and complex subsystems. Policy assemblages, as mixes of policy tools and goals, are an appropriate unit of analysis for EGT because they embody the theory's emphasis on co-evolving elements within policy systems. In rational practice, policymakers design policies within assemblages by establishing objectives, collecting information, comparing options, strategizing implementation, and selecting instruments. However, as EGT implies, this logical progression does not always materialize so tidily—some policies emerge from carefully considered blueprints while others evolve from muddled processes, laissez faire happenstance, or happy accident. Products of the latter often include loosely steered, unmoored, and 'non-designed' path dependencies that confound linear logic and are understudied in the policy literature. There exists the need for a more intricate analytical vocabulary to describe this underexplored 'chaotic' end of the policy design spectrum, as conjuring images of 'muddles' or 'messes' has exhausted its usefulness. This article introduces a novel metaphor for non-design—the bird nest—to bring studies of policy design and non-design into lexical harmony.

Abstract
City diplomacy has a long history and has witnessed a clear sprawl over the last century. Successive "generations" of city diplomacy approaches have emerged over this period, with a heyday of networked urban governance in the last two decades. The covid-19 pandemic crisis presents a key opportunity to contemplate the direction of city diplomacy amid global systemic disruptions, raising questions about the effectiveness of differing diplomatic styles across cities but also the prospect of a new generational shift. This essay traces the history of generations in city diplomacy, examines prospects for novel ways of understanding city diplomacy, and contemplates how the pandemic's impact heralds not the demise of internationalization in urban governance but an era in which city diplomacy is even more crucial amid fundamental limitations.

ABSTRACT
With indiscriminate geographic and socio-economic reach, COVID-19 has visited destruction of life and livelihoods on a largely unprepared world and can arguably be declared the new millennium's most trying test of state capacity. Governments are facing an urgent mandate to mobilize quickly and comprehensively in response, drawing not only on public resources and coordination capabilities but also on the cooperation and buy-in of civil society. Political and institutional legitimacy are crucial determinants of effective crisis management, and low-trust states lacking such legitimacy suffer a profound disadvantage. Social and economic crises attending the COVID-19 pandemic thus invite scholarly reflection about public attitudes, social leadership, and the role of social and institutional memory in the context of systemic disruption. This article examines Hong Kong as a case where failure to respond effectively could have been expected due to low levels of public trust and political legitimacy, but where, in fact, crisis response was unexpectedly successful. The case exposes underdevelopment in scholarly assumptions about the connections among political legitimacy, societal capacity, and crisis response capabilities. As such, this calls for a more nuanced understanding of how social behaviours and norms are structured and reproduced amidst existential uncertainties and policy ambiguities caused by sudden and convergent crises, and how these can themselves generate resources that bolster societal capacity in the fight against pandemics.

The circular economy is a much discussed pathway towards sustainability. While some scholarly work has been carried out on barriers towards a circular economy, there are relatively few academic studies on policies that may accelerate a transition towards a circular economy. Those that focus on policies mostly scrutinize existing policies. The study at hand utilizes data from semi-structured interviews with 47 public and private sector circular economy experts from the European Union to explore expectations regarding circular economy policies, with expectations possibly going beyond existing policies. Expectations identified via this work include more robust standards and norms in production, expansion of circular procurement, tax relief for circular products, liberalization of waste trading and its facilitation through virtual platforms, support for eco-industrial parks, and awareness campaigns. The set of policy recommendations is presented from a life-cycle perspective that is necessary for a transition towards a circular economy. The study aims to contribute to the nascent body of circular economy literature concerning policies and may be of particular interest to practitioners.