Why is collaboration an important element for film or theater production? describe specific aspects where collaboration is vital to the success of the production.

People can contribute different things because different people have different strengths, and when one has an idea the other(s) can build on to that idea. When there are 2 or more people working on a project, it becomes better than it would be if the project was being worked on individually. The work has more potential.

Depends on which book your talking about or movie.