This can become a problem if DVDs are used since DVDs are meant for once through, linear viewing. Most chapters begin and end on natural scene boundaries but usually several scenes are contained within one chapter. This means that to find a scene within a chapter, the user must search manually. This is time consuming and imprecise, thus inconvenient for teachers. It makes sense to list the scenes with a short description of the place, time, characters, topics and purpose.
Scenes have a variety of purposes.
Some merely introduce a character or establish the atmosphere of the story. Others serve as transitions form one place or time to another. Other scenes convey information as to the hero's dilemma, or the technical knowledge needed to understand the rest of the story. Knowing the purpose of the scene will assist in the design of activities to exploit it and will help the developer to decide how much time needs to be spent on it. This can include idioms and target vocabulary as well as speech acts or discourse routines.