Summarization of text in a document may be requested in dependence upon the position of the text in relation to other text within the document or the position of the document containing the text within a plurality of documents in a document structure. Summarization of text in a document may also be requested in dependence upon a user's interaction with an application in conjunction with a version of the document or with a document structure including the document. Different levels of summarization may be applied to different segments of text within a document.