topic-oriented, informative multi-document summarization, where the goal is to produce a single text as a compressed version of a set of documents

Topic Creation: As you are reading the documents, look for one or more aspects that interest you; make a note of these aspects, if you wish. Formulate a DUC topic, which is a request for information about the aspects of the TREC topic that interest you. This can be in the form of a question or set of related questions.
a)The answer can be found in the relevant documents;
c)At least 25 documents must each contribute some material to the answer.