Dynamic Domain (DD): The Dynamic Domain track was started in TREC 2015. The name contains two parts. "Dynamic" means that it is a dynamic search task. It is search in multiple runs of interactions and the participting systems are expected to adjust their systems dynamically based on the relevance judgments provided along the way. "Domain" means that it is a search task for domains of special interests, which usually produces complex and exploratory searches with multiple runs of user and search engine interactions.
Goal: The goal of the DD Track is to support research in dynamic, exploratory search within complex information domains.