This thesis aims to discern the particularities of family non -listed companies in relation to corporate governance. It isspecially focussed in non-listed companies, because research on corporate governance has been so far focussed on largemultinational firms. Non-listed family firms, nowadays the most common form of private initiative, pose particular problems of corporate governance, since the interconnection between family and company is a source of conflicts of interest that a public company does not face. Initially, the reasons why corporate governance has a crucial importance in this type of enterprise – due to its unique nature- are presented. This is to demonstrate the existence of uniqueness with regard to the configuration of ownership, management and control, as these companies have the distinction of being at the crossroads of two divergent systems: family and enterprise (Part I). The family business behaves differently because the family component predominates and undoubtedly influences the processes of decision making, control mechanisms and overall management. Part 2 is devoted to the proposal of a set of measures which, make ensure the effectiveness of the governance system of a non-listed family enterprise. It essentially entails a step change in the prevailing culture of the boards, a strengthening of expertise and improved information and management. The strict separation of management and control is also proposed.
