1 . OFFICIALS - APPLICATION TO THE COURT - INTEREST IN BRINGING PROCEEDINGS - SUBMISSION OF INFRINGEMENT OF ESSENTIAL PROCEDURAL REQUIREMENT - LIMITED DELEGATION OF POWERS - INADMISSIBILITY OF SUBMISSION ( STAFF REGULATIONS , ART . 91 ) 2 . OFFICIALS - SCIENTIFIC OR TECHNICAL STAFF - STAFF PAID FROM RESEARCH AND INVESTMENT APPROPRIATIONS - ASSIGNMENT TOGETHER WITH BUDGETARY POST TO TASKS NOT FORMING PART OF A RESEARCH PROGRAMME - NOT PERMISSIBLE ( STAFF REGULATIONS , ART . 92 ) 3 . OFFICIALS - SCIENTIFIC OR TECHNICAL STAFF - STAFF PAID FROM RESEARCH AND INVESTMENT APPROPRIATIONS - OFFICIALS OF THE ADMINISTRATIVE OR LANGUAGE STAFF - DIFFERENCE IN TREATMENT - BASIS - SPECIAL FEATURES OF THE DUTIES PERFORMED - VACANCY NOTICE EXCLUDING OFFICIALS PAID FROM RESEARCH APPROPRIATIONS - VACANT POST NOT CONTRIBUTING TO THE FULFILMENT OF A RESEARCH PROGRAMME - DISCRIMINATION - NONE ( STAFF REGULATIONS , ARTS 92 TO 101 ) 4 . OFFICIALS - ORGANIZATION OF DEPARTMENTS - DISCRETION OF ADMINISTRATION - DECISION RELATING TO A ROTATION SYSTEM FOR OFFICIALS ASSIGNED TO NON-MEMBER COUNTRIES - LEGAL NATURE ( STAFF REGULATIONS , ART . 110 )