A semidocumentary is a form of book, film, or television program presenting a fictional story that incorporates many factual details or actual events, or which is presented in a manner similar to a documentary.
Characteristics
Stylistically, it has certain similarities to Italian Neorealism, such as the use of location shooting and employing non-actors in secondary roles. However, the viewer is not intended to mistake a semidocumentary for a real documentary; the fictional elements are too prominent.[1]
In the late 1940s, semidocumentary films were often associated with film noirthrillers, sharing a commitment to on-location shooting, gritty realism, and understated performances.
Decline
In the 1960s and 1970s, the semidocumentary style declined in feature films. The standard documentary had blurred the difference between itself and fiction so much that there was viewer confusion regarding what they were seeing.[1]
^McGee, Scott. "The Phenix City Story". WatchTCM. Turner Classic Movies. Retrieved 2021-02-22. Part semi-documentary, part social problem film, part film noir, Phil Karlson's The Phenix City Story (1955) is a one-of-a-kind window into a sordid and fascinating period in American crime history.