"In the beginning was the word", and the word serves a script in a theatrical, or cinematic, or television work.
Following faithfully the "rules" that Aristotle defined centuries ago in his Poetics - although in art everything is fluid and subject to revision - the modern screenwriter, especially the emerging one, serves his own vision, seeking his personal stamp.
In this endeavor, the Script: From theory to practice has much to offer, both with its theoretical analysis and the various practical examples it provides, as well as with the interesting discussion, in the Third Part of the book, where established screenwriters and actors share their own experience and the obstacles they encountered in the arduous journey of writing.