This process originated from the work of Andy Peal, Barbara Evans, and the World Bank on faecal sludge management which is documented in the following papers:
- Fecal sludge management (FSM): analytical tools for assessing FSM in cities. By Andy Peal, Barbara Evans, Isabel Blackett, Peter Hawkins and Chris Heymans. Published September 2014, 4 (3) 371-383; DOI: 10.2166/washdev.2014.139. http://washdev.iwaponline.com/content/4/3/371
- Fecal sludge management: a comparative analysis of 12 cities. By Andy Peal, Barbara Evans, Isabel Blackett, Peter Hawkins and Chris Heymans. Published December 2014, 4 (4) 563-575; DOI: 10.2166/washdev.2014.026. https://SFD.susana.org/resources/recommended-readings?details=2212