Documentary
Check point 1
The London marathon is filmed as a documentary because it is an event documentary as it is a major event and it uses voice overs etc. to keep the audiences interest intact.
Check point 2
Big brother is a fly on the wall documentary as 14 house mates have to stay in a house for a certain amount of time (put in a situation) as they use montages throughout the day and use the most interesting bits to convert it into an hour episode. Also it includes interviews from the housemates to talk about how they feel.
Documentary forms
Check point 1
Actuality filming uses footage of real events, places etc. however it is different compared to documentary as it doesn’t have a proper narrative or structure compared to documentary it had more raw footage just put to together it was however then used to be turned into documentary.
Check point 2
They are usually seen as aspirational because they usually focus on accomplishing practical objective and usually are lifestyle programs containing elements of other genres e.g. How to shows.