ABSTRACT
Topic detection and tracking (TDT) is a research program and an evaluation paradigm that investigates techniques for automatically organizing broadcast news stories by the events that they describe. TDT is an outgrowth of information retrieval (IR) technology and shares many of its techniques and ideas. The specific tasks within event-based organization and the nature of the stories to which those tasks are applied, means that TDT admits a range of approaches that are not universally applicable within IR.
