Every screenwriter MUST remember that the plot is LIVING! The audience MUST always be focusing on a single action-idea throughout every story event! In addition, the plot and character(s) work together, and action MUST have a connection to the plot. Aristotle believed that "Plot is soul." Because the plot is the very structure that arouses emotions from an audience, it is paramount. To write a good plot, you MUST consider the end. For example: Let's say we are building a tree-house. The visual image of the finished house is the end, so everything in the story needs to lead you to the completed tree-house.
Just a few tidbits while plotting away!!!
