1 . OBJECTION OF ILLEGALITY - MEASURES WHICH MAY BE ALLEGED TO BE ILLEGAL - PROVISIONS OF ECSC GENERAL DECISIONS - PROVISIONS CONSTITUTING THE BASIS OF THE CONTESTED INDIVIDUAL DECISION ( ECSC TREATY , ART . 36 , THIRD PARA .) 2 . ECSC - PRODUCTION - SYSTEM OF STEEL PRODUCTION QUOTAS - UNDERTAKINGS CONCERNED - GROUPS OF CONCENTRATED UNDERTAKINGS - CONCEPT - REFERENCE TO ARTICLE 66 OF THE TREATY - WHETHER PERMISSIBLE - ENTITY TO WHICH QUOTAS ARE ALLOCATED - UNDERTAKING WHICH DIRECTS THE PRODUCTION OPERATIONS IN THE GROUP ( ECSC TREATY , ARTS 58 , 66 AND 80 ; DECISION NO 1696/82/ECSC , ART . 2 ( 4 )) 3 . ECSC - PRODUCTION - SYSTEM OF STEEL PRODUCTION QUOTAS - ADJUSTMENT OF QUOTAS FIXED FOR A GROUP OF UNDERTAKINGS - REFERENCE PRODUCTION ( DECISION NO 1696/82/ECSC , ARTS 2 ( 4 ) AND 14 )