What are (too high) inventories in production are in administrative areas the work stocks. Orders, invoices, purchase orders… everything that is left lying around and piling up is considered waste. With invoices, this is obvious at first glance: the later I send them, the longer I have to wait for my money and have direct monetary disadvantages. With orders or other work packages, it is usually the case that the processing effort increases if we wait a long time: the training period is longer, additional documents are often more difficult to obtain, requirements may have changed. Think of the tax return: the longer you wait to sort the documents, the greater the effort usually becomes. And finally, profits can also be lost or only flow later if the order processing is delayed.