Manufacturing companies have to adapt to serve consumer needs that increases the need for raw materials, which requires huge storage capacity. They try to eliminate the need to build large warehouses with a JIT or a JIS system. Only the most basic parts / raw materials are kept in stock, the rest are kept on constant delivery. The JIT philosophy forms the basis of the JIS system, which already sets up the right order among suppliers as it is needed for production. This can be supported by a well-functioning time slot mangement system.