As per the case facts, the High Court of Delhi allowed arbitration petitions and appointed an arbitrator under Section 11(6) of the Arbitration Act concerning disputes arising from a contract ... between Indian Oil Corporation Limited (IOCL) and NCC Limited for civil, structural, and piping works. IOCL filed the appeals, feeling aggrieved by the High Court's appointment of an arbitrator, specifically challenging whether the claims raised by NCC Limited were "notified claims" as per the contract's terms and thus eligible for arbitration. The question arose whether claims made by the contractor that were not notified strictly in accordance with the contractual provisions regarding notice period and particulars should be deemed waived and thus not arbitrable. Finally, the Supreme Court allowed some appeals and partly allowed another, quashing and setting aside the High Court's judgments and orders where applicable. The Court emphasized the importance of strict compliance with contractual clauses regarding claim notification, stating that claims not notified in the prescribed manner and within the stipulated time would be deemed waived. It also clarified how claims should be reflected in the final bill to be valid.