Research and Planning - Cinema Trip

This picture here shows me taking a trip to my local cinema to see a newly released film.
While I was there I particularly analysed the different film trailers that were shown before the film. There were about four or five film trailers shown all appropriate for the age rating of the film i was watching. The film trailers were different lengths depending on their purpose. If the film was about to come out fairly soon then the full length trailer would be shown which would last about 3 minutes long, whereas if the film was just being introduced to the audience, it would only be about a minute long and would be purely there to make the audience aware of the film leaving them wanting more.