Unfortunately contemporary designers do not acknowledge these layers in their designs and so create headaches and material waste for building users who are typically forced, for example, to tear up the structure of the building to make changes in the mechanical services like plumbing and electrical. In Brands words (p.20), An adaptive building has to allow slippage between the differently-paced systems of Site, Structure, Skin, Services, Space Plan and Stuff. Otherwise the slow systems block the flow of the quick ones, and the quick ones tear up the slow ones with their constant change. Embedding the systems together may look efficient at first, but over time it is the opposite, and destructive as well.