This Guidebook was developed by the World Bank and DNV KEMA Energy & Sustainability to provide guidance to cities and urban practitioners on designing and implementing a Low Carbon City Development Program (LCCDP) that complies with the LCCDP Assessment Protocol. An LCCDP is a systems-approach to low carbon development, including a framework and comprehensive set of requirements, that helps cities to plan, implement, monitor and account for low carbon investments and climate change mitigation actions across all sectors over time. The main content of the Guidebook is presented in four sections that correspond to the stages of LCCDP development:Initiation, Planning, Execution, and Assessment/Evaluation.