Networks are increasingly important for advancing urban science, policy and practice. The complexity that cities present to stakeholders of all kinds demands systems-based and networked approaches to solving sustainability challenges. This article analyses the contemporary rise of global networks of urban science, policy, and practice. We provide an overview of urban science, policy, and practice networks followed by a detailed case study of the emerging Future Earth Urban Knowledge Action Network (Urban KAN), highlighting its vision, initial activities and impacts, and challenges and remaining tasks. Findings from the case study reveal that a network across science, policy and practice can make significant contribution in cutting-edge knowledge generation, global research agenda setting, timely contribution to global policy processes, catalyzing the formation of new national and thematic research-action networks, among others. In contrast, such a network also faces challenges, in terms of attraction and representation of the composition, maintaining initial momentum, turning the science-policy integration and collaboration into reality, and obtaining strong and continued financial and institutional support. We conclude that networks across the boundaries of science-policy-practice are still in their infancy, and deeper collaborations across sector, scale, and networks that enable the implementation of effective new actions will be key indicator in measuring the success of these networks.

网络对于推进城市科学，政策和实践越来越重要。城市向各种利益相关者展示的复杂性要求采用基于系统和网络的方法来解决可持续性挑战。本文分析了城市科学，政策和实践全球网络的当代兴起。我们对城市科学，政策和实践网络进行了概述，然后对新兴的未来地球城市知识行动网络（Urban KAN）进行了详细的案例研究，突出了其愿景，初步活动和影响以及挑战和剩余任务。案例研究的结果表明，跨科学，政策和实践的网络可以为前沿知识的产生，全球研究议程的制定，对全球政策流程的及时贡献做出重大贡献，促进新的国家和专题研究行动网络的形成等。相反，这种网络在构成的吸引力和代表性，保持最初的势头，将科学政策整合与协作变为现实以及获得强有力和持续的财政和体制支持方面也面临挑战。我们得出的结论是，跨越科学，政策，实践边界的网络仍处于起步阶段，跨部门，规模和网络的更深入的协作（这些方面能够实施有效的新措施）将是衡量这些网络成功与否的关键指标。保持最初的势头，将科学政策的整合与协作变为现实，并获得持续的强大财政和机构支持。我们得出的结论是，跨越科学，政策，实践边界的网络仍处于起步阶段，跨部门，规模和网络的更深入的协作（这些方面能够实施有效的新措施）将是衡量这些网络成功与否的关键指标。保持最初的势头，将科学政策的整合与协作变为现实，并获得持续的强有力的财政和机构支持。我们得出的结论是，跨越科学，政策，实践边界的网络仍处于起步阶段，跨部门，规模和网络的更深入的协作（这些方面能够实施有效的新措施）将是衡量这些网络成功与否的关键指标。