what do you consider to be the most important element of project management, and why?

Before watching the film, what do you consider to be the most important element of project management, and why?

Watch: https://www.youtube.com/watch?v=oC9fUwQyriE

2) Has your answer changed after watching the video? Why?

For both of your answers, you may want to explain how that element plays a role in the whole of project management. You might want to explore some of the issues or tasks involved with that element. Finally, after watching the video you may want to include examples of the element.