Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
This paper provides a very good understanding of the CHAST approach with its development and tools.
DE VREEDE, E. (2004): CHAST “Children’s Hygiene And Sanitation Training” In Somalia. The Netherlands: School Sanitation and Hygiene Education Symposium URL [Accessed: 26.04.2019]