1 . SOCIAL POLICY - MALE AND FEMALE WORKERS - PAY - EQUALITY - PRINCIPLE - SCOPE - APPLICATION NOT CONFINED TO THE CONTEMPORANEOUS PERFORMANCE OF ' ' EQUAL WORK ' ' - DIFFERENCE IN PAY DUE TO FACTORS UNCONNECTED WITH ANY DISCRIMINATION ON GROUNDS OF SEX - MATTER FOR THE NATIONAL COURT OR TRIBUNAL TO DECIDE ( EEC TREATY , ART . 119 ) 2 . SOCIAL POLICY - MALE AND FEMALE WORKERS - PAY - EQUALITY - CRITERIA OF ASSESSMENT - WORK ACTUALLY PERFORMED ( EEC TREATY , ART . 119 )