The document discusses designing a timeline tool to help users explore and understand complex news stories over time by highlighting key details and events. It proposes visualizing related content across BBC platforms within an interactive timeline interface that allows zooming in and out. Examples of stories that could be depicted include the Leveson Inquiry, Premier League seasons, and the Hillsborough disaster. The document outlines initial design concepts, potential use cases, and priorities for a pilot version, as well as future enhancements like bookmarking events and comparing narratives. Key challenges mentioned are ensuring usability, managing information density, and accessing suitable historical data.