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What is the most important screenwriting tool? (originally I answered this question on Quora)
For me, a "tool" is some process, habit or approach that can be taught. When I work with screenwriters at USC's School of Cinematic Arts, I can't help the students with talent or luck, which are by far the two most important factors in a screenwriter's success.
Likewise, I can't really teach imagination, stamina, or even self-delusion (important as they are). Practical knowledge of industry standards as well as willingness to listen to honest feedback are certainly necessary, but I expect both of these when a student walks into the classroom or an aspiring screenwriter asks me for advice. What I can teach is a process.
To read the whole post, go here: http://genrehacks.blogspot.com/2013/12/this-is-what-rewrite-looks-like.html