expert opinion: scientific views or comments by a group of designated experts based on a review of scientific evidence

chill footage : Footage used to set the scene

actuality footage: footage caught in moment of a historic event by bystander or CCTV

reconstructions : scene that have happened that are reconstructed using actors

process footage : footage that shows the making of the documentary

library footage : Footage filmed from news sources to explain the story at the time

infographics : Graphics of data used being put up on screen

Noddy shots : reaction shots to encourage subjects to speak during interviews