29The conditions for taking up the profession of civil engineer have not thus far been the subject of harmonisation at Community level. That being so, the Member States retain the power to define those conditions, as the Directive does not restrict their powers on this point. They must, however, exercise their powers in this area in a manner which respects the basic freedoms guaranteed by the EC Treaty (see Joined Cases C-193/97 and C-194/97 De Castro Freitas and Escallier [1998] ECR I-6747, paragraph 23; Case C-58/98 Corsten [2000] ECR I-7919, paragraph 31; and Mac Quen, paragraph 24).
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