 The legitimate purposes of the European Union include 

This has been regularly recited in EU Directives, such as 2005/36/EC of 7 September 2005 "on recognition of professional qualifications".That abolishing of obstacles has brought in its train a series of Directives by which the EEC/EC/EU had been carrying out its functions vis-à-vis Member States in connection with the mutual recognition of the qualifications of architects and certain other professions.It was pursuant to those Directives that a person from one Member State (or certain other states) wishing to practise in another might be required to produce a certificate of qualification; and that in the United Kingdom, the Architects Registration Board has been acting as the "Competent Authority" in respect of architects.