Do you know offhand what requirements are stipulated in the German Regulation on the Award of Public Contracts (Vergabeverordnung)? What about the rationalisation effect provided by RAL Gütezeichen (Quality Marks)? What role do thresholds play? And are foreign bidders permitted to apply for RAL Gütezeichen (Quality Marks)? If you want to read more about these things before issuing your next invitation to tender then the Glossary of RAL Gütezeichen (Quality Marks) is just the right source: The glossary explains important terms linked to invitations to tender.