The sequence approach to screenwriting, sometimes known as “eight-sequence structure”, is a system developed by Frank Daniel, while he was the head of the Graduate Screenwriting Program at USC. It is based in part on the fact that, in the early days of cinema, technical matters forced screenwriters to divide their stories into sequences, each the length of a reel (about ten minutes).
The sequence approach mimics that early style. The story is broken up into eight 10-15 minute sequences. The sequences serve as “mini-movies”, each with their own compressed three-act structure. The first two sequences combine to form the film’s first act. The next four create the film’s second act. The final two sequences complete the resolution and dénouement of the story. Each sequence resolution creates the situation which sets up the next sequence.