Walden Two is a utopian novel written by behavioral psychologist B. F. Skinner, first published in 1948. At that time, it was considered as science fiction since science-based methods for altering people's behavior did not exist then. Such methods are now known as applied behavior analysis. The book is controversial because its characters speak of a rejection of free will, including a rejection of the proposition that human behavior is controlled by a non-corporeal entity, such as a spirit or a soul. It embraces the proposition that the behavior of organisms, including humans, is determined by environmental variables, and that systematically altering environmental variables can generate a sociocultural system that very closely approximates utopia. Source: Wikipedia (en)