1 . ACTION FOR ANNULMENT - ACTION BROUGHT BY AN ASSOCIATION OF UNDERTAKINGS AGAINST GENERAL ECSC DECISIONS - INTEREST IN BRINGING PROCEEDINGS - CONDITIONS ( ECSC TREATY , ART . 33 , SECOND PARA ., AND ART . 48 ) 2 . OBJECTION OF ILLEGALITY - MEASURES AGAINST WHICH AN OBJECTION OF ILLEGALITY MAY BE RAISED - PROVISIONS OF GENERAL ECSC DECISIONS - PROVISIONS FORMING THE BASIS OF THE CONTESTED INDIVIDUAL DECISION ( ECSC TREATY , ART . 36 , THIRD PARA .) 3 . ECSC - INSTITUTIONS - COMMISSION - POWERS - LIMITS ( ECSC TREATY , ART . 8 ; TITLE III ) 4 . ECSC - PRODUCTION - SYSTEM OF STEEL PRODUCTION QUOTAS - APPLICATION TO ALL UNDERTAKINGS OF UNIFORM ABATEMENT RATES - GENERAL INCREASE OF QUOTAS FOR A GROUP OF UNDERTAKINGS - PROCEDURE TO BE FOLLOWED ( ECSC TREATY , ART . 58 ; DECISIONS NOS 2794/80 , 1831/81 , 533/82 , 1696/82 AND 1698/82 )