The world of labor is only partially regulated by law. In many areas, non-state norms regulate the obligations of employers and employees. This regulatory mix has a long tradition in Germany. However, legal history has usually focused on the genesis and interpretation of statutory provisions. Although the existence of non-state law – especially in the form of collective bargaining agreements and work regulations – was known, its content was rarely presented and evaluated. The following report is about a project that responds to this research deficit and aims to help make a hitherto largely unknown world of norms visible again.