The reference framework does not propose a binding framework or a specific model for all cities or municipalities. It is for each local authority to assess its own situation, define its objectives and create the appropriate instruments to achieve them. The Reference Framework is intended to offer guidance and support for improving decision-making and action on sustainability. It is not a panacea for all our sustainability challenges. The aim is also to encourage local authorities to develop their own measures or actions, which best suit them and which are possibly not fully reflected in the Reference Framework. It would be useful if users shared their experience of and insights from using the toolkit to help further its development.