Inspection supervision has been widely applied in different areas of administrative field. The idea and meaning of inspection supervision are analize in this final thesis, together with its individual elements such as goals accomplished by its implementation and many other aspects. The powers granted to inspectors for quality implementation of supervision and rights granted to parties in order to protect their interests are also presented along with changes in organizational structures of inspection supervision and effects it has on the quality of implementation. In addition, the importance of applying varied principles during implementation supervison and the most common and complex issues encountered by inspection supervision authorities in the Republic of Croatia and within the EU are specified. One part of the thesis deals with inspection – the organizational structure of school inspection in Croatia, its tasks, working methods, characteristics and similarities with school inspections in the EU are reviewed. Moreover, the amendment regarding anonymous reports to school inspections and public opinion about it have been outlined.