This document aims at providing basic training materials for practioners dealing with support to Fos. These materials have been developed through and for a support process to group of Cambodian support staffs from the State administration and NGOs. This process was developed by a Cirad-Ciepac team from september 2005 to january 206. It takes place in the context of mainly grassroots' young Fos that prevailing in Cambodia. The materials are designed on the basis of field experience cases that are presented in comprehensive way in another document.