Cities are increasingly expected to bring urban stakeholders together to deploy smart solutions that address urban challenges and deliver long-term positive impacts. Yet, existing theory and practice struggle to explain how such impacts can be achieved, measured or evidenced. This paper makes two major contributions. Firstly, the paper shows how the Quadruple Helix (QH) innovation approach can be used as the basis for co-producing smart city projects in order to better capture their impacts. In doing so we present a synthesis of current smart city and QH literatures to argue that assessment criteria and indicators must be co-produced with the full set of smart city stakeholders to ensure relevance to context and needs. Secondly, we present an example of a co-produced monitoring and assessment framework and methodology, developed to capture and measure the impacts of smart and sustainable city solutions with the stakeholder teams involved in the European Union Triangulum smart city programme. The paper draws on experiences working with 27 smart city demonstration projects involving public, private and third-sector organisations and communities across Manchester (United Kingdom), Eindhoven (The Netherlands) and Stavanger (Norway). We show how involving QH stakeholders in co-producing impact assessment improves the ability of projects to deliver and measure impacts that matter to cities and citizens. We conclude with a series of lessons and recommendations intended to be of use to the range of organisations and communities currently involved in smart city initiatives across Europe and the world.

人们越来越期望城市将城市利益相关者聚集在一起，部署智能解决方案，以应对城市挑战并产生长期的积极影响。然而，现有的理论和实践难以解释如何实现、衡量或证明这些影响。本文有两个主要贡献。首先，本文展示了如何将四螺旋 (QH) 创新方法用作联合生产智慧城市项目的基础，以更好地捕捉其影响。在此过程中，我们综合了当前的智慧城市和 QH 文献，以论证评估标准和指标必须与全套智慧城市利益相关者共同制定，以确保与背景和需求相关。其次，我们提供了一个联合制作的监测和评估框架和方法的例子，开发旨在与参与欧盟 Triangulum 智慧城市计划的利益相关者团队一起捕捉和衡量智慧和可持续城市解决方案的影响。本文借鉴了与 27 个智慧城市示范项目合作的经验，这些项目涉及曼彻斯特（英国）、埃因霍温（荷兰）和斯塔万格（挪威）的公共、私营和第三部门组织和社区。我们展示了让 QH 利益相关者参与共同产生影响评估如何提高项目交付和衡量对城市和公民重要的影响的能力。最后，我们总结了一系列经验教训和建议，旨在对目前在欧洲和世界范围内参与智慧城市计划的各种组织和社区有用。