On a German building site, each trade works under its own contract and its own employer. When employees of several employers work on one site, the client must appoint a safety and health coordinator, the SiGeKo. The rule has applied since the building site ordinance took effect on 1 July 1998. The coordinator draws up the safety plan and coordinates how the firms work together. He is not their boss. The Bavarian model contract for public building projects gives him no power to issue instructions. Except in imminent danger, he reports problems: In allen anderen Fällen sind der Objektüberwacher und der Auftraggeber auf kurzem Wege zu informieren. In all other cases, the site supervisor and the client are to be informed directly.