Directives require transposition into the domestic legal system of the Member State in order to become effective. If a Member State fails to transpose the Directive in a timely manner or fails to do it at all, the Directive will take 'direct effect', that is, individuals are able to derive rights from that Directive directly despite not being transposed into domestic law. A Directive could be transposed through enactment under legislation from the national parliament or through agreement by reference. The Directives are flexible to the extent that the national authorities of the Member States have the choice of the form and method of the implementation of the Directive. This takes into account the fact that Member States have differing legal systems. Hence this allows the establishment of a harmonised framework of laws whilst preserving the established national laws of each member. This is the major appeal of harmonisation over unification.