While during the first decade of SCI, voluntary projects were mainly relief services for regions affected by natural disasters, as of 1931 voluntary projects were implemented in other areas of social commitment as well, such as community projects (Wales) and development aid (India).  Humanitarian projects also took place: support was provided to refugee children during the Spanish Civil War and twenty years later also to war orphans in Tunisia during the Algerian independence war.

An international organization

During the first decades voluntary projects were organized with no formal structure. But as the idea of organizing ‘workcamps’ expanded to more countries after World War II, an international association of SCI member organizations with an international secretariat in Paris was founded. The exchange of volunteers and the organization of voluntary projects were improved and the number of workcamps, volunteers and member organizations increased tremendously. In the sixties regional coordination structures for Africa, Asia and Europe were set up.