Whether for companies or for public authorities: RAL Gütezeichen (Quality Marks) can be extremely helpful with invitations to tender. This is because of the high level of reliability provided by the quality marks. Public authorities can rely on the fact that the company holding a RAL Gütezeichen (Quality Mark) meets the requirements specified in the invitation to tender. Some RAL Gütezeichen (Quality Marks) are thus accepted as proof of the bidder’s eligibility and their fulfilment of the delivery conditions in the invitation to tender.