In this story, Asimov describes U.S. Robots' attempt to introduce robots on the planet Earth. Robots have already been in use on space stations and planetary colonies, where the inhabitants are mostly highly trained scientists and engineers. U.S. Robots faces the problem that on Earth, their robots will encounter a wide variety of people, not all of whom are trustworthy or responsible, yet the Three Laws require robots to obey "all" human orders and devote equal effort to protecting "all" human lives. Plainly, robots must be programmed to differentiate between responsible authorities and those giving random, whimsical orders.