The document discusses using surveys and focus groups to gather feedback at different stages of a thriller film production. Feedback from an initial survey identified that characters needed to be more relatable. Feedback on a rough cut suggested improving the lighting and setting. Focus groups provided guidance on trailer conventions like building suspense and revealing some but not all of the plot. Feedback was incorporated at each stage, culminating in a final trailer that met audience expectations for mystery, tension, and an antagonist/protagonist confrontation.