This paper describes a framework for multi-document summarization which combines
three premises: coherent themes can be identified reliably; highly representative themes,
running across subsets of the document collection, can function as
multi-document summary surrogates; and effective end-use of such themes
should be facilitated by
a visualization environment which clarifies the relationship between
themes and documents. We present algorithms that formalize our framework,
describe an implementation, and demonstrate a prototype system and interface.