The court discusses the conditions under which a party may be estopped from raising a ground for refusal of enforcement under the Convention or has waived the right to raise it.

Due process: The court discusses various irregularities affecting due process, including letters not sent, names of arbitrators or experts not communicated, language of proceedings and communications, etc.

Public policy: The court discusses the meaning of (international as compared to domestic) public policy, generally defined as the basic notions of morality and justice of the enforcement State.

Public policy: The court discusses the effect of other alleged violations of public policy on the recognition and enforcement of an arbitral award, such as contradictory reasons, manifest disregard of the law (US), etc.