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Service delivery model : the legal and institutional setup for the provision of WASH services. A service delivery model includes all links in the value chain, the method of provision, the end use of services and the level of service delivered. Examples include a community water supply, a utility’s sewerage service, and water kiosks managed by a small private provider. [Source: Huston, A. & Moriarty, P.B., 2018. Understanding the WASH system and its building blocks : building strong WASH systems for the SDGs. (IRC WASH systems series) The Hague, the Netherlands: IRC. P. 5]