Harmonisation generally takes place on two levels of governance, the overarching body and each of the members individually. Taking the European Union, the two levels are the European level and national level. Although both European and national legislators share the legislative responsibilities, neither of these bodies has final responsibility for the whole. Also, there is no superior political authority which has the final say on who is responsible for what, i.e. no overarching authority over the European and national legislators. The European Court of Justice may however determine the extent of harmonisation when determining cases.