The expository mode: This mode focuses on issues in an argumentative frame using a traditional narrative structure, mediated with a narrator who directly addresses the audience. There is a direct and constant relationship between the narration and images or film footage which in concession are in support of the argument of the film. The narrator may also appear as a 'character' for example, in many of David Attenborough's films documenting many issues that affect the planet and it's inhabitants. This helps to show that the issue is important and it does involve the viewer, it also evokes a bigger reaction. It is used to question content that the viewer may be aware of but unsure of what the causes are, in which rhetorical questions are used and later possible answers could be given to build up an understanding of an issue. The purpose of the footage is to strengthen the narrative that is being spoken, so that when a view is given there is evidence to back it up and make it more valid.
This documentary type is used quite frequently, and other media forms such as film features, news stories, and television programs rely on it as a way of transferring information. It is easy to create however can lead to a biased view, although with the footage as evidence this wouldn't be as likely.
Personally I think this mode is most effective for a more serious documentary as you can research your topic or hypothesese and illustrate your findings in a clear and precise way, and then further evaluate and interpretate the information that has previously been found to what it is like now.
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