1 . ACTS OF THE INSTITUTIONS - DIRECTIVES - IMPLEMENTATION BY MEMBER STATES - REQUIREMENTS OF LEGAL CLARITY AND CERTAINTY - IMPLEMENTATION BY MEANS OF ADMINISTRATIVE PRACTICES - INSUFFICIENCY ( EEC TREATY , ART . 189 ) 2 . ACTS OF THE INSTITUTIONS - DIRECTIVES - RIGHT OF PARTIES CONCERNED TO RELY ON DIRECTIVES IN THE ABSENCE OF ADEQUATE MEASURES OF IMPLEMENTATION - EFFECT NOT FREEING MEMBER STATES FROM THEIR OBLIGATION TO IMPLEMENT DIRECTIVES ( EEC TREATY , ART . 189 ) 3 . MEMBER STATES - OBLIGATIONS - IMPLEMENTATION OF DIRECTIVES - FAILURE TO FULFIL OBLIGATIONS - JUSTIFICATION - INADMISSIBILITY ( EEC TREATY , ART . 169 )