In ufology, the psychosocial hypothesis, abbreviated PSH, argues that at least some UFO reports are best explained by psychological or social means. It is often contrasted with the better-known extraterrestrial hypothesis (ETH), and is particularly popular among UFO researchers in the United Kingdom, such as David Clarke, Hilary Evans, the editors of "Magonia" magazine, and many of the contributors to "Fortean Times" magazine. It is also popular in France since the publication in 1977 of a book written by Michel Monnerie, "Et si les ovnis n'existaient pas?" ("What if ufos do not exist?").