The SME policy is a central element of the renewed Lisbon strategy for growth and employment. The SME are in the focus of European policy. The SME are often excluded from collective representation. The number of employees organized in trade unions goes down with decreasing sizes of enterprises and a functioning works council system is rarer in small enterprises than in bigger ones. This publication focuses on presenting co-determination structures in the small and medium-sized enterprises (SME) in Belgium, Bulgaria, Denmark, Italy and Slovenia. Special emphasis was given to three sectors which are traditionally characterized by a high concentration of SME: the textiles industry, the retail trade and the construction industry.