German labor law speaks of peace here. While a collective wage agreement is in force, neither side may take industrial action, strikes or lockouts, over the matters it settles. This is the Friedenspflicht, the duty to keep the peace. It does not have to be written into the agreement, because it is considered inherent in every collective agreement. Strikes over matters the agreement does not cover remain allowed. Inside a company, the law goes further. Industrial action between employer and works council is not allowed at all, and both must avoid anything that disturbs den Frieden des Betriebs, the peace of the workplace.