International organization — European Coal and Steel Community — Compensation payments to Belgian mines — Whether threat to reduce or withdraw compensation amounts to discrimination forbidden by Treaty — Discretion of High Authority to determine compensation for different types of coal.

Disputes — International courts — Court of European Coal and Steel Community — Pleadings — Request — Form and content of — Whether reference to statement in request in similar action sufficient — Admissibility of grounds raised in reply but not in request.

International organization — European Goal and Steel Community — Treaty establishing the Community, Article 33 — Decisions of High Authority — Whether general or individual — Letter from Authority specifying required action — Whether letter constitutes decision — Right of associations and enterprises to challenge general decisions — Grounds upon which challenge may be based.