Every German employee who leaves a job has a legal right to a written reference, the Arbeitszeugnis. The law says it must be clear and easy to understand. In practice, set phrases carry the grade. Stets zu unserer vollsten Zufriedenheit, always to our fullest satisfaction, means very good. In 2014 the Federal Labor Court ruled that zur vollen Zufriedenheit, to full satisfaction, counts only as befriedigend, a middle grade. An employee who wants a better grade must prove that he earned it.
The same ruling quotes legal commentators. When 86.6 percent of references rate performance as good or very good, they write, a reference no longer says anything about what the employee can actually do. The ruling does not name the study behind the figure.