Traditionally, German colleagues begin with Sie, the formal you. Moving to du, the familiar you, is a step that one side offers. The German Knigge Society, which advises on manners, gives the rule. Der Vorgesetzte bietet dem Untergebenen das „Du” an. The superior offers the du to the subordinate. Among equals, the older may offer it to the younger. The Society for the German Language observed in 2020 that Germans use du more often now. But it added that the du does not mean the hierarchy has gone.