A Certification of Work Order for Bidding is a certificate issued by a Chartered Engineer (CE) to verify that the work orders submitted by a bidder as proof of past experience are genuine, technically relevant, and satisfy the eligibility criteria specified in the tender. This certification is often required in tenders issued by organizations such as GAIL, IOCL, BPCL, HPCL, ONGC, NTPC, BHEL, SAIL, and other government or public sector undertakings (PSUs), particularly when bidders rely on previous work experience to meet qualification requirements.