 The lack of experience with new technological innovations can also affect what counts as negligent use of the technology. In order to operate a new computer system, users typically have to go through a process of training and familiarization with the system. It requires skill and experience to understand and imagine how the system will behave (Coeckelbergh and Wackers 2007). Friedman describes the case of a programmer who invented and was experimenting with a ‘computer worm’, a piece of code that can replicate itself. At the time this was a relatively new computational entity (1990). The programmer released the worm on the Internet, but the experiment quickly got out of the control when the code replicated much faster than he had expected (see also Denning 1989). Today we would not find this a satisfactory excuse, familiar as we have become with computer worms and viruses. However, Friedman poses the question of whether the programmer really acted in a negligent way if the consequences were truly unanticipated. Does the computer community’s lack of experience with a particular type of computational entity influence what we judge to be negligent behavior?