Transparency, non-discrimination and economic efficiency: The German Regulation on the Award of Public Contracts (Vergabeverordnung) clearly stipulates the framework for public invitations to tender. Amongst other things, the competence of the bidder, clearly defined costs and environmental compatibility all play an important role. All these requirements are also some of the characteristics embodied by RAL Gütezeichen (Quality Marks) and the transparent RAL quality assurance system. Products and services holding RAL Gütezeichen (Quality Marks) can thus be found in almost all public sectors.