This is an idea that will be presented in details in ISWA 2008 Conference at Singapore. The concept, developed in the framework of a paper about "Barriers and Drivers for SRF applications in Low-Income Countries", written by A. Mavropoulos, R. Skoulaxinou, A. Mentzis and K. Naoum, provides a way to understand SWM development and the dependence from Gross Domestic Product per capita, Policy, Know-How and History-Culture. Some excerpts are found at:
http://www.scribd.com/doc/4020462/The-Change-Ring
