I am writing a screenplay and having trouble with the first act the most actually. I really feel like I have the second and third act down to what I want. For the first act, it's mostly introducing the characters and their plots, before they all come together, to build into the main plot. Chronologically it does not matter what order most of them happen in because it's introducing different characters, with different sides of the story. One does not have to come before or after another in a particular order. For example, in The Good, The Bad, and the Ugly, they decide to introduce Tuco first in one sequence. Then the next sequence moves onto Angel Eyes, and the next sequence that follows after, is also about Angel Eyes. The next sequence after that is back to Tuco, followed by the sequence after, where he meets Blondie. As you can see, in the first five sequences it did not matter what order they were in, chronologically. They could have cut back and forth between the two characters, or they could have introduced Angel Eyes first, before moving onto Tuco and Blondie. Or they could have not even introduced Angel Eyes until the second act evening. Yet for some reason, the writers thought this was best. In The Dark Knight, it starts out with a scene of the Joker, then the next few scenes are about Batman/Bruce Wayne, fighting crime, and then doing his thing at home and at work. The next few scenes after are all about Harvey Dent. In The Departed, we have the scenes that describe Costigan's backstory and when he meets Quinan and Quinan decides to put him undercover, in their office meeting. We have also have Sullivan's back story, and it shows him meeting Donnelly, and his role once promoted to sergeant. Now they could have shown these stories in the same style as The Dark Knight, and show all of Costigans scenes first, and then show all of Sullivans scenes, but they decide to cut back and forth constantly between the two. So for my first act, I cannot decide which approach I should take. I am not sure on my order, but more so, I am not sure if I should cut back and forth between characters, or should I show one, then other, then other, all in separate segments. Is their any rules or guides I should follow on how to approach which technique for which type of story? Thanks for the info .