International organization — European Coal and Steel Community — Decisions of High Authority — Distinction between general and individual decisions — Circumstance in which letter from official can constitute a decision.

Court of Justice of the European Communities — Law applied by Relevance of “general principles of law” — Principle of certainty — Principle of legality — Reference to municipal laws of Member States on legality of withdrawal of administrative acts — Respective functions of Court and High Authority of E.C.S.C. in balancing public and private interests concerned.

Court of Justice of the European Communities — Grounds for appeal to Court — Whether appeal for exces de pouvoir under Article 33 of E.C.S.C. Treaty may result in finding of liability for jaute de service.

International organization — European Coal and Steel Community — Subsidy system for imported steel scrap — Levy on scrap purchased within Community — Exemption of enterprise's “own resources” of scrap — Legality of exemption in case of associated but separate companies — Meaning of “enterprise” in E.C.S.C. Treaty, Article 80 — Whether two or more companies can constitute a single enterprise — Legality of retroactive withdrawal of illegal act which has conferred rights or advantages — Effect of absence of provision in decision of High Authority allowing derogation from general provisions of decision — Whether power to grant derogations may be presumed.