Analyzing a Discourse community: The film industry
A good lighting director should know that in small rooms where an interview may be taking place with a single camera, a three point lighting set up would be optimal. This kind of set up takes only three lights; a key light, a fill light, and a back light. Even then the job isn't done. Anyone setting up these lights also has to know what kind of creative atmosphere the director is looking for so he or she knows if they needs to use soft lights, a scoop light, or even colored gels to put on the lights that give a different effect. Usually people working on movies or a television show have a deadline so things must get done in whatever specific way the producers and director want them.
These examples also apply to the second reason described; getting things done quickly. As was stated before, there is always a deadline that must be met. It takes a lot of time to prepare for making a movie or TV show or even just shooting a scene. Everyone has to know what their job is and how to do it the right way in order for things to get done speedily. An example might be that if a boom operator doesn't know what type of microphone to use out in the field or inside on the set of a sitcom then there will