1 . MEASURES ADOPTED BY THE INSTITUTIONS - APPLICATION RATIONE TEMPORIS - NON- RETROACTIVITY - EXCEPTIONS - CONDITIONS ( EEC TREATY , ART . 191 ) 2 . MEASURES ADOPTED BY THE INSTITUTIONS - STATEMENT OF THE REASONS ON WHICH MEASURES ARE BASED - DUTY TO PROVIDE - OBJECTIVE - SCOPE ( EEC TREATY , ART . 190 ) 3 . EUROPEAN COMMUNITIES - OWN RESOURCES - COUNCIL DECISION OF 21 APRIL 1970 - OBJECTIVE - BUDGETARY MEASURE NOT OPERATING AS A BAR ON THE CREATION OF AN ISOGLUCOSE PRODUCTION LEVY ( COUNCIL DECISION OF 21 APRIL 1970 )