Council of Europe conventions/treaties are also open for signature to non-member states, thus facilitating equal co-operation with countries outside Europe. The Council of Europe's most famous achievement is the European Convention on Human Rights, which was adopted in 1950 following a report by the Council of Europe's Parliamentary Assembly, and followed on from the United Nations 'Universal Declaration of Human Rights' (UDHR). The Convention created the European Court of Human Rights in Strasbourg. The Court supervises compliance with the European Convention on Human Rights and thus functions as the highest European court. It is to this court that Europeans can bring cases if
Council of Europe its members for the purpose of safeguarding and realising the ideals and principles which are their common heritage and facilitating their economic and social progress." Membership is open to all European states who seek harmony, cooperation, good governance and human rights, accepting the principle of the rule of law and are able and willing to guarantee democracy, fundamental human rights and freedoms. While the member states of the European Union transfer part of their national legislative and executive powers to the European Commission and the European Parliament, Council of Europe member states maintain their sovereignty but commit themselves through conventions/treaties