The local level is emerging like a solution to the crisis of Welfare State. At this
level, we face high complexity, because of the number of actors and the heterogeneity of strategies. To open this lock, the study of the third sector labour market is proposed like a useful key. The apparent contradiction in this issue is rich of many research themes. After an analysis of the role of third sector in
services supply and labour policies, some hypothesis are suggested about the relationships between voluntary action and labour market (by the demand and the supply side). At the end, a research design about different welfare mixes at local level is sketched.