This document discusses elements needed for long-term engagement in an interactive story or game, including: - An engaging story that keeps people interested and participating over time - Opportunities for users to interact with and participate in shaping the narrative - A social aspect where fans can connect with each other and with characters It also outlines different layers of an interactive story (story, participation, content, experience) and various platforms, tools, and techniques that could be used to deliver an immersive interactive story experience across websites, social media, text messages, apps and other channels.