Dan O'Bannon famously crafted his screenplays using a self-designed system which he called "dynamic structure." This book outlines how O'Bannon's method differs from those of other well-known screenwriting gurus, and illustrates with examples from classic (and not-so-classic) films how dynamic structure can be applied to craft narrative and character. O'Bannon also includes his insights on subjects such as the logic of the three-act structure, the role of the producer in screenplay development, and the psychological principle known as "hedonic adaptation," which has a unique effect on the structuring of screen stories.