We are familiar with this term in computer software, a bug can create a frustrating problem. This also apply to nanomachine, if we leave them alone it might create a bigger glitch. These bugs can be caused because of misreading specification that someone else design or making it do too many other thing. In addition to software bugs there is also process errors. Assemblers might install the wrong atom at the wrong location, and this will make the nanorobot unstable. (Crandall)