Documentary Approaches

Having thoroughly read the brief, I found a part on the possible approaches to a documentary, this interested me and opened my eyes at the actual variety of documentaries there are available, they go as follows,
Observational;-the filmmaker does not intervene but uses the camera to observe the day to day life of the documentary subject-usually requires a contributor highly involved in an interesting task that has a finite time span.
Direct Cinema; - the filmmaker is very much an active participant in the film, interrogating the subject of the film to reveal information.
Educational/informative; - the film usually revolves around exploring a subject in detail and presenting factual or expert information, often with multiple contributions from different contributors.
Poetic; - uses metaphor, visual lyricism and soundscape or music to portray an aspect of life- often with a universal human theme.
Investigative;-usually a journalistic approach exposing information not commonly known, or understood.
Collage; - often combine stills, archive, found footage and moving image and juxtaposes them to shed new light on a subject area.