1. A method in a computer system for identifying significant sentences of a document, the method comprising: training a classifier to classify words as important or not important to a document based on multiple scores for a word generated from different scoring techniques, a score indicating a technique-specific importance of a word to the document; generating scores from the different scoring techniques for words of the document; identifying important words of the document using the trained classifier to classify from the generated scores those words that are important to the document; and calculating significance of sentences of the document based on the identified important words contained in the sentences.