We define Query-Chain Focused Summarization as follows: for each query in an exploratory search session, we aim to extract a summary that answers the information need of the user, in a manner similar to Query-Focused Summarization, while not repeating information already provided in previous steps, in a manner similar to Update Summarization.
to queryfocused summarization, the context of a sum-mary is not a single query, but the set of queries that led to the current step, their result sets and the corresponding summaries.