Pratchett collaborated with the folklorist Dr Jacqueline Simpson on The Folklore of Discworld (2008), a study of the relationship between many of the persons, places and events described in the Discworld books and their counterparts in myths, legends, fairy tales and folk customs on Earth.
Pratchett je surađivao sa folkloristicom Dr. Jacqueline Simpson u pisanju knjige Folklor Disksvijeta (2008.), koja je usporedila osobe, mjesta i događaje opisane u Disksvijet knjigama i njihove izvore u mitovima, legendama i bajkama stvarnog svijeta.