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The main objective of this handbook is to guide the development of investable NbS propositions and bankable NbS projects for both public and private investors through different modes of governance, funding and implementation arrangements. The methodology it proposes - the Financing Framework for Water Security - is well suited for large scale NbS and combinations of NbS projects; hybrid strategies and project portfolios for water security, hydro-meteorological risk reduction and water supply. This handbook offers operational advice and project preparation guidelines, including hands-on formats that project proponents can use continuously and iteratively to develop the entire business case of NbS, enabling them to go from the idea stage towards an investment proposal or investment project stage that can be effectively assessed by potential investors. To illustrate the use of these guidelines the handbook presents the results of their application to three cases in Europe within the NAIAD project and to one case in Asia that was part of the Water as Leverage for Resilient Cities Asia programme.