How well must a German employee work? In 2003 the Federal Labor Court gave an answer that labor lawyers still quote: Der Arbeitnehmer muss tun, was er soll, und zwar so gut, wie er kann. The employee must do what he is supposed to do, and do it as well as he can. In 2008 the court dealt with a worker in a mail-order warehouse. His error rate was between 4.01 and 5.44 per thousand. According to the employer, the average of the 209 workers in the third quarter of 2004 was 1.34. A clearly higher error rate over a long period can point to a breach of duty, the court said. The employee must then explain it.