 Okay, that's it about the needs of careful management. The final drawback I would like to mention is the possibility of technical problems. This is perhaps best shown by this quote from Patrice Preston in a 2008 article. The example Preston gives is from Canary Wharf skyscraper in London. A software bot means that half of the elevators stopped working at all. While the others saw randomly between fours or didn't stop at all. It told the team of software engineers ten days of constant work to fix the problem. During which office workers didn't know how long it would take them to get to the office. Clients were not able to attend conference in the buildings. And all the authorities had to stop during daytime compared this situation to a conventional office where one lived might have been out of service causing minor inconvenience. But all the others would have carried on. Okay.