This guidebook for people in school settings is intended to offer strategies for use and adaptation with children and families to re-establish routines of hygiene with basic access to water and sanitation services through an approach that visibly shows that the school is WASHfriendly, inclusive - so... that all children, including those with disabilities have "ownership of the information and activities", and sustainable, repeating messages "over time to encourage lasting behaviour change"
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This paper provides a very good understanding of the CHAST approach with its development and tools.