tokens: A small company manufactures customized bicycles . Whenever the sales department receives an order , a new process instance is created . A member of the sales department can then reject or accept the order for a customized bike . In the former case , the process instance is finished . In the latter case , the storehouse and the engineering department are informed . The storehouse immediately processes the part list of the order and checks the required quantity of each part . If the part is available in-house , it is reserved . If it is not available , it is back-ordered . This procedure is repeated for each item on the part list . In the meantime , the engineering department prepares everything for the assembling of the ordered bicycle . If the storehouse has successfully reserved or back-ordered every item of the part list and the preparation activity has finished , the engineering department assembles the bicycle . Afterwards , the sales department ships the bicycle to the customer and finishes the process instance .