„In order to develop and implement a CE strategy in urban environments it is crucial to find a framework of indicators to monitor the progress and performance and, when necessary, adapt the ongoing processes. Based on the literature review, the following objectives of CE indicators can be identified:

• Support performance assessment – Indicators are the cornerstone of monitoring as they quantify and aggregate data that helps track various elements of the CE;
• Support policy-making – ensure evidence-based urban planning and management of the CE;
• Support accountability and CE promotion – provide information on the progress of cities towards the CE and its benefits, which can be communicated to citizens (accountability);
• Support improvement – indicators can help identify key success factors and good practices on the transition to CE.“ (p 7)